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CANNON BALL, ND - NOVEMBER 30: An activist staying at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation digs out from a recent snowfall on November 30, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172 mile long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois. (Photo by Scott Olson/Getty Images)

CANNON BALL, ND - NOVEMBER 30:  An activist staying at  Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation digs out from a recent snowfall on November 30, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the  Dakota Access Pipeline. The proposed 1,172 mile long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois.  (Photo by Scott Olson/Getty Images)

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CANNON BALL, ND - DECEMBER 01: Patty Sam Porter of the Colville tribe in Washington state talks about their journey after traveling from the headwaters of the Missouri River in a dugout canoe to join activists at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 1, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois. (Photo by Scott Olson/Getty Images)

CANNON BALL, ND - DECEMBER 01:  Patty Sam Porter of the Colville tribe in Washington state talks about their journey after traveling from the headwaters of the Missouri River in a dugout canoe to join activists at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 1, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois.  (Photo by Scott Olson/Getty Images)

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CANNON BALL, ND - DECEMBER 02: Myron Buchholz, a retired school teacher from Eau Claire, Wisconsin delivers straw to be used for insulation to a native American activist at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 2, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois. (Photo by Scott Olson/Getty Images)

CANNON BALL, ND - DECEMBER 02:  Myron Buchholz, a retired school teacher from Eau Claire, Wisconsin delivers straw to be used for insulation to a native American activist at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 2, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois.  (Photo by Scott Olson/Getty Images)

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CANNON BALL, ND - DECEMBER 01: Native Americans from Washington state arrive at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation after traveling from the headwaters of the Missouri River in a dugout canoe on December 1, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois. (Photo by Scott Olson/Getty Images)

CANNON BALL, ND - DECEMBER 01:  Native Americans from Washington state arrive at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation after traveling from the headwaters of the Missouri River in a dugout canoe on December 1, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois.  (Photo by Scott Olson/Getty Images)

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CANNON BALL, ND - DECEMBER 01: Native American activists, (Lto R) J.P. Pacodas, Patty Sam Porter, and Virginia Redstar the Colville tribe in Washington state talk about their journey after traveling from the headwaters of the Missouri River in a dugout canoe to join activists at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 1, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois. (Photo by Scott Olson/Getty Images)

CANNON BALL, ND - DECEMBER 01:  Native American activists, (Lto R) J.P. Pacodas, Patty Sam Porter, and Virginia Redstar the Colville tribe in Washington state talk about their journey after traveling from the headwaters of the Missouri River in a dugout canoe to join activists at Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 1, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have been gathering at the camp for several months trying to halt the construction of the Dakota Access Pipeline. The proposed 1,172-mile-long pipeline would transport oil from the North Dakota Bakken region through South Dakota, Iowa and into Illinois.  (Photo by Scott Olson/Getty Images)