Overnight Defense: US shoots down Iranian drone | Pentagon sending 500 more troops to Saudi Arabia | Trump mulls Turkey sanctions | Trump seeks review of Pentagon cloud-computing contract

THE TOPLINE: President Trump on Thursday said a U.S. Navy vessel shot down an Iranian drone in a "defensive action" in the Strait of Hormuz.Trump said the USS Boxer shot down the drone after it got within 1,000 yards, "ignoring...