Meanwhile, Pentagon Chief of Staff Kevin Sweeney announced he was resigning Saturday. Sweeney’s resignation comes just over two weeks after James Mattis stepped down as secretary of defense, publicly rebuking Trump’s foreign policy moves. He is the third senior Pentagon official to resign since Trump announced the U.S. would withdraw troops from Syria. Pentagon spokesperson Dana White also left her position last week. White was being investigated for ethics violations at the time of her departure.