President Biden halted construction on border wall projects along the U.S.-Mexico boundary within hours of taking office Wednesday, marking what might be the end to one of the Trump administration’s highest-profile undertakings.

“The proclamation directs an immediate pause in wall construction projects to allow a close review of the legality of the funding and contracting methods used, and to determine the best way to redirect funds that were diverted by the prior Administration to fund wall construction,” the White House executive order stated.