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US President Donald Trump announces the final approval of the XL Pipeline following a meeting with the National Economic Council in the Oval Office of the White House on March 24, 2017 in Washington, DC. At left is TransCanada CEO Russell Girling with US Commerce Secretary Wilbur Ross (C). / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US President Donald Trump announces the final approval of the XL Pipeline following a meeting with the National Economic Council in the Oval Office of the White House on March 24, 2017 in Washington, DC. At left is TransCanada CEO Russell Girling with US Commerce Secretary Wilbur Ross (C). / AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)