Trump praised former volunteer fire chief Corey Comperatore, 50, who died trying to protect his wife and daughter on July 13 when Thomas Matthew Crooks, 20, opened fire on the crowd in the small Western Pennsylvania town.
More than two-and-a-half-months ago, Thomas Matthew Crooks fired eight rounds at Trump in an assassination attempt, grazing the former president's right ear, killing Comperatore, and injuring two other attendees.
Elon Musk will campaign with the former president on Saturday, joining a rally at the scene of a summer assassination attempt and cementing his role as one of the Republican candidate's key backers.
Republican presidential nominee Donald Trump held a campaign rally in Butler in the state of Pennsylvania, where he was shot at a rally in July.