 From ABC News, I'm Sherry Preston. As President Biden prepares to host the NATO summit in Washington starting today, more questions surround his candidacy for 2024 following the debate and his interview with ABC's George Stephanopoulos. ABC senior White House correspondent Mary Bruce has been questioning officials about all of it. The press secretary adamant that President Biden has only been evaluated by a neurologist three times, each as part of his regular annual physicals.