President Trump said he ordered a series of airstrikes on Yemen's capital, Sanaa, on Saturday, promising to use "overwhelming lethal force" until Iranian-backed Houthi rebels cease their attacks on shipping along a vital maritime corridor. The Houthis said nine civilians were killed. Our brave Warfighters are right now carrying out aerial attacks on the terrorists' bases, leaders, and missile defenses to protect American shipping, air, and naval assets, and to restore Navigational Freedom," Trump said in a social media post. "No terrorist force will stop American commercial and naval vessels from freely sailing the Waterways of the World."