Trump’s running mate, Ohio Sen. JD Vance, also will be on hand at the Butler Farm Show grounds, as will billionaire Elon Musk.

Former President Donald Trump is back in Butler, PA for a rally just months after a gunman tried to assassinate him there. NBC News' Dasha Burns reports on the new security measures in place this time around.

Donald Trump's staffers are on edge. There have been death threats directed at his aides, and his team isn’t as able to quickly organize the mass rallies that have always been the signature of his campaigns.