People walk outside the Fiserv Forum ahead of the 2024 Republican National Convention, Saturday, July 13, 2024, in Milwaukee. Donald Trump's campaign said in a statement that the former president was "fine" after a shooting at his rally in Butler, Pa. A local prosecutor says the suspected gunman and at least one attendee are dead. (AP Photo/Alex Brandon)

Republican presidential candidate former President Donald Trump is covered by U.S. Secret Service agents at a campaign rally, Saturday, July 13, 2024, in Butler, Pa. (AP Photo/Evan Vucci)

Republican presidential candidate former President Donald Trump is helped off the stage at a campaign event in Butler, Pa., on Saturday, July 13, 2024. (AP Photo/Gene J. Puskar)

President Joe Biden speaks, Saturday, July 13, 2024, in Rehoboth Beach, Del., addressing news that gunshots rang out at Republican presidential candidate former President Donald Trump's Pennsylvania campaign rally. (AP Photo/Manuel Balce Ceneta)