Nafeesa Syeed Bill Faries Bloomberg

Trump himself has sent some conflicting signals about what would trigger a U.S. military response. He suggested Friday morning that the U.S. isn't looking to make a pre-emptive strike, saying on Twitter that the military stood ready to act "should North Korea act unwisely."

Trump himself has sent some conflicting signals about what would trigger a U.S. military response. He suggested Friday morning that the U.S. isn't looking to make a pre-emptive strike, saying on Twitter that the military stood ready to act "should North Korea act unwisely."