FILE - In this March 24, 2017 file photo, President Donald Trump, flanked by Commerce Secretary Wilbur Ross, left, and Energy Secretary Rick Perry, is seen in the Oval Office of the White House in Washington, during the announcing of the approval of a permit to build the Keystone XL pipeline, clearing the way for the $8 billion project.A federal judge in Montana has blocked construction of the $8 billion Keystone XL Pipeline to allow more time to study the project's potential environmental impact. U.S. District Judge Brian Morris' order on Thursday, Nov. 8, 2018, came as Calgary-based TransCanada was preparing to build the first stages of the oil pipeline in northern Montana. Environmental groups had sued TransCanada and The U.S. Department of State in federal court in Great Falls. (AP Photo/Evan Vucci, File)
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