FILE – In this June 1, 2020, file photo President Donald Trump departs the White House to visit outside St. John’s Church in Washington. Walking behind Trump from left are, Attorney General William Barr, Secretary of Defense Mark Esper and Gen. Mark Milley, chairman of the Joint Chiefs of Staff. Milley says his presence “created a perception of the military involved in domestic politics.” He called it “a mistake” that he has learned from. (AP Photo/Patrick Semansky, File)