This combination of photos shows former President Donald Trump in New York, April 23, 2024, from left, President Joe Biden in Scranton, Pa., April 16, 2024, and former President Jimmy Carter, July 10, 2021, in Plains, Ga. Trump is running against Biden, but Trump, the presumptive Republican nominee, keeps bringing up Carter. Trump likes to cite the 99-year-old former president as a measuring stick to belittle Biden. (AP Photo)
FILE - President Jimmy Carter, left, and Sen. Joseph R. Biden Jr., greet Biden supporters at a reception in Wilmington, Del., Feb. 20, 1978. Former President Donald Trump is running against President Biden, but Trump, the presumptive Republican nominee, keeps bringing up former President Carter. Trump likes to cite the 99-year-old former president as a measuring stick to belittle Biden. (AP Photo)
In this photo released by The White House, former President Jimmy Carter, center left, and former first lady Rosalynn Carter, center right, pose for a photo with President Joe Biden, right, and first lady Jill Biden at the home of the Carter's in Plains Ga., April 30, 2021. Former President Donald Trump is running against Biden, but Trump, the presumptive Republican nominee, keeps bringing up Carter. Trump likes to cite the 99-year-old former president as a measuring stick to belittle Biden. (Adam Schultz, The White House via AP)