President Trump, flanked by Commerce Secretary Wilbur Ross (left), and Energy Secretary Rick Perry (right), in March 2017, announcing the approval of a permit to build the Keystone XL pipeline. On Monday two Native American tribes filed a lawsuit seeking a judge to rescind the permit for the $8 billion project.

President Trump, flanked by Commerce Secretary Wilbur Ross (left), and Energy Secretary Rick Perry (right), in March 2017, announcing the approval of a permit to build the Keystone XL pipeline. On Monday two Native American tribes filed a lawsuit seeking a judge to rescind the permit for the $8 billion project.