CANNON BALL, NORTH DAKOTA - DECEMBER 4: US US veterans and native americans hold hands in prayer and solidarity on the road near Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 4, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have gathered at the camp to try to halt the construction of the Dakota Access Pipeline. (Photo by Helen H. Richardson/The Denver Post via Getty Images)

CANNON BALL, NORTH DAKOTA - DECEMBER 4:  US US veterans and native americans hold hands in prayer and solidarity on the road near Oceti Sakowin Camp on the edge of the Standing Rock Sioux Reservation on December 4, 2016 outside Cannon Ball, North Dakota. Native Americans and activists from around the country have gathered at the camp to try to halt the construction of the Dakota Access Pipeline. (Photo by Helen H. Richardson/The Denver Post via Getty Images)