NEW: President Trump says the U.S. will hold Iran responsible if the Houthis continue attacking ships in the Middle East. "If they do this again, the U.S. will

NEW: President Trump says the U.S. will hold Iran responsible if the Houthis continue attacking ships in the Middle East. "If they do this again, the U.S. will hold Iran responsible, in that the Houthis are a Surrogate and/or Proxy of Iran, and major military punishment will be inflicted upon Iran …