"Any act of aggression will have severe consequences, for which the U.S. will bear full responsibility," Iranian Permanent Representative to the United Nations Amir Saeid Iravani wrote in a letter to U.

President Donald Trump on Monday said that further attacks or retaliation by the Houthis would be considered an attack by Iran and it would face “dire” consequences. Trump’s threat comes after the United States launched a new series of airstrikes against the Yemeni group beginning Saturday.

The U.S. president’s threat raises questions about whether he would risk a wider Mideast war over disruptions to global commerce.