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WASHINGTON, DC - MARCH 08: Visitors look at a tepee that was set up by Dakota Access Pipeline protesters near the Washington Monument on March 8, 2017 in Washington, DC. Indigenous rights activists have started to set up a tepee camp next to the Washington Monument ahead of a protest against the Dakota Access pipeline. Thousands are expected to protest this Friday at the Army Corps of Engineers headquarters and outside of the White House. (Photo by Justin Sullivan/Getty Images)

WASHINGTON, DC - MARCH 08:  Visitors look at a tepee that was set up by Dakota Access Pipeline protesters near the Washington Monument on March 8, 2017 in Washington, DC. Indigenous rights activists have started to set up a tepee camp next to the Washington Monument ahead of a protest against the Dakota Access pipeline. Thousands are expected to protest this Friday at the Army Corps of Engineers headquarters and outside of the White House.  (Photo by Justin Sullivan/Getty Images)