President Joe Biden dropped out of the 2024 race for the White House on Sunday, ending his bid for reelection after a disastrous debate with Donald Trump that raised doubts about the incumbent’s fitness for office with the election just four months away. It was a late-season campaign thunderstrike unlike any in American history.

The decision comes after escalating pressure from Biden’s Democratic allies to step aside following the June 27 debate, in which the 81-year-old president trailed off, often gave nonsensical answers and failed to call out the former president’s many falsehoods. Biden endorsed Vice President Kamala Harris to take on Trump, and encouraged his party to unite behind her.