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US Senator Bernie Sanders (C) speaks during a rally in front of the White House in Washington, DC, September 13, 2016, as demonstrators gathered to protest the Dakota Access Pipeline. The US government on September 9, 2016 sought to stop work on a controversial oil pipeline in North Dakota that has angered Native Americans, blocking any work on federal land and asking the company to 'voluntarily pause' work nearby. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

US Senator Bernie Sanders (C) speaks during a rally in front of the White House in Washington, DC, September 13, 2016, as demonstrators gathered to protest the Dakota Access Pipeline.
The US government on September 9, 2016 sought to stop work on a controversial oil pipeline in North Dakota that has angered Native Americans, blocking any work on federal land and asking the company to 'voluntarily pause' work nearby. / AFP / JIM WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)