While the U.S. said it would not put boots on the ground, officials said the support would make clear the administration's hard-line stance on Iran. During a visit to Saudi Arabia this week, Defense Secretary James Mattis accused Iran of being a troublemaker, saying the country was destabilizing the region by supplying the Houthis with weapons. "Everywhere you look, if there's trouble in the region, you find Iran," Mattis said Wednesday after meetings with King Salman and other top Saudi officials.