WILMINGTON, Del. (AP) — President Joe Biden’s choice to run the Federal Aviation Administration has withdrawn his nomination, a setback for the administration that comes after Denver International Airport CEO Phillip Washington failed to gain enough support in the closely divided Senate.

Washington’s withdrawal was confirmed Saturday night by a person familiar with the situation who insisted on anonymity to discuss the matter. The White House did not immediately respond to a request for comment.

Republicans were united in opposition to Washington, calling him unqualified because of limited aviation experience. Democrats and allied independents still might have pushed the nomination through, but key senators on their side balked at supporting Biden’s pick.