FILE - Protesters against the Dakota Access oil pipeline congregate, Nov. 21, 2016, on a long-closed bridge on a state highway near Cannon Ball., N.D. near their camp in southern North Dakota. (AP Photo/James MacPherson, File)FILE - Dakota Access pipeline protesters defy law enforcement officers who are trying to force them from a camp on private land in the path of pipeline construction, Oct. 27, 2016, near Cannon Ball, N.D. (AP Photo/James MacPherson, File)
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FILE - Protesters against the Dakota Access oil pipeline congregate, Nov. 21, 2016, on a long-closed bridge on a state highway near Cannon Ball., N.D. near their camp in southern North Dakota. (AP Photo/James MacPherson, File)
