President Donald Trump is expected to take executive action Tuesday to advance construction of the Keystone XL and Dakota Access oil pipelines.

That’s according to a person with knowledge of the action. The president is scheduled to sign orders at the White House late Tuesday morning.

Former President Barack Obama killed the proposed Keystone XL pipeline in late 2015, declaring it would have undercut U.S. efforts to clinch a global climate change deal that was a centerpiece of his environmental legacy. The pipeline would run from Canada to U.S. refineries in the Gulf Coast. The U.S. government needed to approve the pipeline because it crossed the border.

The Army decided last year to explore alternate routes for the Dakota pipeline after the Standing Rock Sioux tribe and its supporters said the pipeline threatened drinking water and Native American cultural sites.

The person with knowledge of the decisions insisted on anonymity because they were not authorized to confirm the moves ahead of a formal announcement.

(AP)