As President Joe Biden prepares to host the NATO summit in Washington, concerns about his age and health following a poor debate performance are mounting among both Democratic lawmakers and European allies. The summit, marking NATO's 75th anniversary, will focus on issues like Russia's war on Ukraine and NATO's future unity. Behind the scenes, however, there are growing fears about a potential return of Donald Trump, which could affect NATO's stability and support for Ukraine. Some Democratic leaders are privately urging Biden to step aside, with Vice President Kamala Harris being considered as a possible replacement. Despite these internal and external pressures, Biden remains committed to his re-election campaign and aims to demonstrate strong leadership at the summit.