One area where he and Trump contrast sharply is the Iraq War. Trump has called the war a “huge mistake,” while Bolton insists it was the correct move.
He and Trump are staunch opponents of the Iran nuclear deal, but Bolton has gone so far as to call for Iran to be bombed. He also wrote a WSJ op-ed last month titled: The Legal Case for Striking North Korea First.
Bolton served as one of Mitt Romney's foreign policy advisers during his 2012 presidential bid.
Correction: This story has been updated to reflect that Bolton's title was under secretary of state, not assistant secretary of state.