Donald Trump’s rally on Saturday featured the richest man in the world as a speaker, but his performance was panned by critics. Trump over the weekend spoke in Butler, Pennsylvania, where the former president delivered remarks at the location of an attempt on his life three months prior. Republican vice presidential nominee J.D. Vance was slammed for a perceived insult to the man who died during that assassination attempt, and Trump himself paused the rally for several minutes for a medical emergency. Trump also welcomed to the rally stage Elon Musk, the owner of the social media company previ…