U.S. President Donald Trump warns Iran of consequences for further attacks by Yemen's Houthi rebels, linking the group to Iran. Trump's comments come as his administration continues airstrikes targeting the rebels. Houthi supporters rally in several cities, vowing revenge against America and Israel. Trump alleges that Iran is controlling the Houthis and supplying them with weapons and money. It is unclear what sparked Trump's post, but Iran's paramilitary Revolutionary Guard seeks to separate the Houthis' actions from Tehran's. The Houthis have been involved in attacks on merchant vessels and raids on aid facilities.