Mr. Musk, the world’s richest man and the owner of Tesla and X, endorsed the former president after the attempted assassination in July. On Saturday, he returned to the scene and made a spirited rally appearance.

Elon Musk spoke for the first time at a Donald Trump rally, telling a massive crowd in Butler, PA that the election was a “must-win situation.” “As you can see, I am not just MAGA, I’m dark MAGA,” Musk, wearing a black Make America Great Again hat, told the crowd.