A letter that President Joe Biden sent to House Democrats telling them to support him in election, shown Monday, July 8, 2024 in Washington. Biden's letter to Democrats in Congress says he wants them to know he has no intention of exiting this year’s presidential race. Biden sent the letter on Monday on his personal letterhead, not White House stationery. (AP Photo)

President Joe Biden speaks to supporters as first lady Jill Biden, second from left, listens at a campaign rally in Harrisburg, Pa., on Sunday, July 7, 2024. (AP Photo/Manuel Balce Ceneta)

President Joe Biden speaks to supporters as first lady Jill Biden, left, looks on at a campaign rally in Harrisburg, Pa., on Sunday, July 7, 2024. (AP Photo/Manuel Balce Ceneta)

President Joe Biden arrives at Harrisburg International Airport after attending a campaign rally, in Harrisburg, Pa., on Sunday, July 7, 2024. (AP Photo/Manuel Balce Ceneta)

President Joe Biden walks across the South Lawn of the White House in Washington, Sunday, July 7, 2024, after returning from a trip to Pennsylvania. (AP Photo/Susan Walsh)