On Saturday, Elon Musk joined Donald Trump on stage at his rally in Butler, Pennsylvania, where an assassination attempt was made against the former US president last summer, according to CNN and CBS News. During his speech, the billionaire indirectly referenced current US President Joe Biden in a negative light to urge attendees to vote for the Republican presidential candidate, Donald Trump. “I want to say what an honor it is to be here. And you know, the true test of someone’s character is how they behave under fire. We had one president who couldn’t climb a flight of stairs and another who…