President Donald Trump berated his former national security adviser John Bolton on Wednesday, bashing his former top aide after the aide reportedly contradicted a key element of the president's impeachment defense in an upcoming book. Trump went as far to suggest that if Bolton, a conservative war hawk, were still in the White House, the U.S. "would be in World War Six by now." Those comments came hours after another tweet in which Trump asked: "Why didn't John Bolton complain about this 'nonsense' a long time ago, when he was very publicly terminated."