Republican presidential candidate former President Donald Trump is helped off the stage at a campaign event in Butler, Pa., Saturday, July 13, 2024.Gene J. Puskar/AP PhotoMusk endorsed Trump after the former president appeared to be injured at a Pennsylvania rally.Trump had to be escorted offstage after gunshots rang out during his rally.Musk also called Trump the toughest president since Theodore Roosevelt.Elon Musk announced on Saturday that he "fully" endorsed Donald Trump minutes after gunshots erupted at the former President's Pennsylvania campaign rally."I fully endorse President Trump and hope for his rapid recovery," the tech billionaire wrote on Saturday.Musk also posted a widely shared photo of the former president being escorted off stage after gunshots rang out from the crowd.