FILE - This March 24, 2017, file photo shows President Donald Trump, flanked by Commerce Secretary Wilbur Ross, left, and Energy Secretary Rick Perry, announcing the approval of a permit to build the Keystone XL pipeline, clearing the way for the $8 billion project in the Oval Office of the White House in Washington. Attorneys for the Trump administration are due in a Montana courtroom Thursday, May 24, 2018, to defend the approval of TransCanada’s disputed Keystone XL oil sands pipeline project. (AP Photo/Evan Vucci, file)
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