Police use a water cannon on water protectors near Backwater bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20

Police use a water cannon on water protectors near Backwater bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20, 2016. REUTERS/Stephanie Keith

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Police confront water protectors with a variety of guns including a rubber bullet gun and tear gas launcher near Backwater bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian

Police confront water protectors with a variety of guns including a rubber bullet gun and tear gas launcher near Backwater bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20, 2016. REUTERS/Stephanie Keith

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Police tear gas water protectors near Backwater bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20, 2016. REUTE

Police tear gas water protectors near Backwater bridge during a protest against

plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20, 2016. REUTERS/Stephanie

Keith

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Police use a water cannon on water protectors near Backwater bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20

Police use a water cannon on water protectors near Backwater bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20, 2016. REUTERS/Stephanie Keith

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A horse gallops through a confrontation between police and protesters during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November

A horse gallops through a confrontation between police and protesters during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 20, 2016. REUTERS/Stephanie Keith

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A man stands on a makeshift bridge over a river while police stand on the opposite shore during a protest against the building of a pipeline on the Standing Rock Indian Reservation near Cannonball, North Dakota November 2, 2016. REUTERS/Stephanie Keith.

A man stands on a makeshift bridge over a river while police stand on the opposite shore during a protest against the building of a pipeline on the Standing Rock Indian Reservation near Cannonball, North Dakota November 2, 2016. REUT

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Police use pepper spray against water protectors who hold up make-shift shields while standing in the water of a river in front of Turtle Island during a protest against the building of a pipeline near the Standing Rock India

Police use pepper spray against water protectors who hold up make-shift shields while standing in the water of a river in front of Turtle Island during a protest against the building of a pipeline near the Standing Rock Indian Reservation near Cannonball, North Dakota, U.S. November 2, 2016. Water protectors say that Turtle Island is the burial ground of their elders and that the police presence desecrates this sacred place. REUTERS/Stephanie Keith

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A person pours a pepper spray antidote into a water protector's eyes during a during a direct action on Turtle Island in a protest against the building of a pipeline near the Standing Rock Indian Reservation near Cannonball,

A person pours a pepper spray antidote into a water protector's eyes during a

during a direct action on Turtle Island in a protest against the building of a pipeline near the Standing Rock Indian Reservation near Cannonball, North Dakota, U.S. November 2, 2016. Water protectors say that Turtle Island is the burial ground of their elders and that the police presence desecrates this sacred place. REUTERS/Stephanie Keith

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A tipi is seen at sunrise at the Oceti Sakowin encampment during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Cannon Ball, North Dakota, U.S. November 9, 2016. REUTERS/Stephanie

A tipi is seen at sunrise at the Oceti Sakowin encampment during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Cannon Ball, North Dakota, U.S. November 9, 2016. REUTERS/Stephanie Keith

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Protesters block a highway during a protest in Mandan against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 15, 2016. REUTERS/Stephanie Keith

Protesters block a highway during a protest in Mandan against plans to pass the

Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 15, 2016. REUTERS/Stephanie Keith

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A man named Black Horse holds his grandson during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Cannon Ball, North Dakota, U.S. November 13, 2016. REUTERS/Stephanie Keith

A man named Black Horse holds his grandson during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Cannon Ball, North Dakota, U.S. November 13, 2016. REUTERS/Stephanie Keith

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A man from the Lakota Sioux tribe with a Native American tattoo on his neck poses for a photograph in Oceti Sakowin camp during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservat

A man from the Lakota Sioux tribe with a Native American tattoo on his neck poses for a photograph in Oceti Sakowin camp during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 16, 2016.

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A woman kneels in front of police during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation, in Bismarck, North Dakota, U.S. November 14, 2016. REUTERS/Stephanie Keith.

A woman kneels in front of police during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation, in Bismarck, North Dakota, U.S. November 14, 2016. REUTERS/Stephanie Keith.

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A protester holds up a mirror during a protest against the Dakota Access pipeline to “show the police what they look like” near the Standing Rock Indian Reservation near Cannon Ball, North Dakota November 6, 2016. REUTERS/Ste

A protester holds up a mirror during a protest against the Dakota Access pipeline

to “show the police what they look like” near the Standing Rock Indian Reservation near Cannon Ball, North Dakota November 6, 2016. REUTERS/Stephanie Keith

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A protester cries while watching a demonstration on Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota

A protester cries while watching a demonstration on Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 24, 2016. REUTERS/Stephanie Keith

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Protesters stand off with pilice during a protest in Mandan against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 15, 2016. REUTERS/Stephanie Keith

Protesters stand off with pilice during a protest in Mandan against plans to pass 

the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 15, 2016. REUTERS/Stephanie Keith

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Protesters hold signs during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 18, 2016. REUTERS/Stephanie Keith
NORTHDAKOTA-PIPELINE/ Protesters hold signs during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 18, 2016. REUTERS/Stephanie Keith
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A man from the Cheyenne River Sioux tribe with a Native American tattoo on his face poses for a photograph during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cann

A man from the Cheyenne River Sioux tribe with a Native American tattoo on his face poses for a photograph during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 16, 2016. REUTERS/Stephanie Keith

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Chenae Bullock from the Shinnecock tribe poses for a photograph during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 24, 20

Chenae Bullock from the Shinnecock tribe poses for a photograph during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 24, 2016. REUTERS/Stephanie Keith

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A water protector, Chenae Bullock, sings on the banks of a river across from a direct action taking place on Turtle Island during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Can

A water protector, Chenae Bullock, sings on the banks of a river across from a direct action taking place on Turtle Island during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Cannon Ball, North Dakota November 6, 2016. Water protectors say that Turtle Island is the burial ground of their ancestors and that the police presence desecrates this sacred place. REUTERS/Stephanie Keith

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Protesters in favor of the Dakota Access pipeline demonstrate across the street from an Army Corp of Engineers building in Bismarck, as others (not pictured) protest against plans to pass the pipeline near the Standing Rock I

Protesters in favor of the Dakota Access pipeline demonstrate across the street 

from an Army Corp of Engineers building in Bismarck, as others (not pictured) protest against plans to pass the pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 15, 2016. REUTERS/Stephanie Keith

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Protesters block Route 6 in Mandan on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 24, 2016. REUTERS/Stephanie Keith

Protesters block Route 6 in Mandan on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 24, 2016. REUTERS/Stephanie Keith

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Water protectors wearing traditional native garb prepare to cross a river to Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near

Water protectors wearing traditional native garb prepare to cross a river to Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 24, 2016. REUTERS/Stephanie Keith

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People march from Oceti Sakowin camp towards Backwater Bridge and the frontline between protectors and police during a women led demonstration in a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Ca
People march from Oceti Sakowin camp towards Backwater Bridge and the frontline between protectors and police during a women led demonstration in a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Ca
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Cheryl Angel speaks to other water protectors on Backwater Bridge in front of burned out trucks blocking the roadway during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation,

Cheryl Angel speaks to other water protectors on Backwater Bridge in front of burned out trucks blocking the roadway during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 18, 2016. REUTERS/Stephanie Keith

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Women hold a demonstration on Backwater Bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 27, 2016. REUTERS/Steph

Women hold a demonstration on Backwater Bridge during a protest against plans 

to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 27, 2016. REUTERS/Stephanie Keith

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Protesters march along highway 1806, the road outside of Oceti Sakowin camp, during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. No

Protesters march along highway 1806, the road outside of Oceti Sakowin camp,

during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 18, 2016. REUTERS/Stephanie Keith

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Protesters participate in a prayer circle on Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S.

Protesters participate in a prayer circle on Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 24, 2016. REUTERS/Stephanie Keith

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Cheryl Angel offers ceremonial tobacco on Backwater Bridge during a demonstration led by women in a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North D

Cheryl Angel offers ceremonial tobacco on Backwater Bridge during a demonstration led by women in a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 27, 2016. REUTERS/Stephanie Keith

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A veteran holds up a traditional drum during a confrontation between veterans and police on Backwater Bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Ca

A veteran holds up a traditional drum during a confrontation between veterans and police on Backwater Bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S., December 1, 2016. REUTERS/Stephanie Keith

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A person walks a horse past the Oceti Sakowin camp in a snow storm during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 28,

A person walks a horse past the Oceti Sakowin camp in a snow storm during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 28, 2016. REUTERS/Stephanie Keith

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Cekpa Bald Eagle sits by a fire in the Oceti Sakowin camp during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 29, 2016. RE

Cekpa Bald Eagle sits by a fire in the Oceti Sakowin camp during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 29, 2016. REUTERS/Stephanie Keith

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People celebrate in Oceti Sakowin camp as "water protectors" continue to demonstrate against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. December 4,

People celebrate in Oceti Sakowin camp as "water protectors" continue to 

demonstrate against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. December 4, 2016. REUTERS/Stephanie Keith

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A woman holds a branch of cedar during a prayer ceremony on Backwater Bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 27, 2016. REUTERS/Steph

A woman holds a branch of cedar during a prayer ceremony on Backwater Bridge during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November

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A man from the Muskogee tribe looks at the Oceti Sakowin camp shrouded in mist during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Cannon Ball, North Dakota, U.S. November 11, 20

A man from the Muskogee tribe looks at the Oceti Sakowin camp shrouded in mist during a protest against the Dakota Access pipeline near the Standing Rock Indian Reservation near Cannon Ball, North Dakota, U.S. November 11, 2016. REUTERS/Stephanie Keith

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Protesters make a smoky fire on Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 24,

Protesters make a smoky fire on Turtle Island on Thanksgiving day during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, near Cannon Ball, North Dakota, U.S. November 24, 2016. REUTERS/Stephanie Keith

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Jason Pinto holds up his arm while water protectors block highway 1806 in Mandan during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 23, 201

Jason Pinto holds up his arm while water protectors block highway 1806 in

Mandan during a protest against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 23, 2016. REUTERS/Stephanie Keith

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