FILE PHOTO: U.S. President Donald Trump watches as General Charles Brown takes the oath of office as incoming Chief of Staff of the U.S. Air Force in the Oval Office of the White House in Washington, U.S., August 4, 2020. REUTERS/Jonathan Ernst
FILE PHOTO: U.S. President Donald Trump watches as General Charles Brown takes the oath of office as incoming Chief of Staff of the U.S. Air Force in the Oval Office of the White House in Washington, U.S., August 4, 2020. REUTERS/Jonathan Ernst