@foxnews: BREAKING: Houthi rebels are threatening a "swift and painful" response targeting U.S. interests across the Middle East if President Trump joins Saudi military strikes against the group. Houthi official Mohammed Al Bukhaiti warned that Saudi oil facilities and airports could also become targets, urging workers to stay away. The threats follow a deadly Houthi attack on King Khalid International Airport in Riyadh, which killed at least 13 people and wounded hundreds more. Trump condemned the airport attack Monday, saying, "The Houthis are misbehaving very badly."