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DENVER, CO, ST. - NOVEMBER 17: Tom Grant, center, from Westminster joins with a crowd of demonstrators rallying against the Keystone XL Pipeline, gather in front of the Denver office of U.S. Senator Michael Bennet to tell him to vote to reject the the construction of the pipeline. (Photo By Kathryn Scott Osler/The Denver Post via Getty Images)

DENVER, CO, ST. - NOVEMBER 17: Tom Grant, center, from Westminster joins with a crowd of demonstrators rallying against the Keystone XL Pipeline, gather in front of the Denver office of U.S. Senator Michael Bennet to tell him to vote to reject the the construction of the pipeline.   (Photo By Kathryn Scott Osler/The Denver Post via Getty Images)