evidence: Want to know what Biden said when he dropped out? The full letter is here President Biden announced in a letter distributed Sunday afternoon he would step down from the 2024 Democratic presidential nomination. In a later tweet, he endorsed Vice President Harris to become the party's nominee. The announcement comes after numerous Democrats called on Biden to step down from the race after a disastrous debate performance against former President Donald Trump. For more on Biden's decision and the now open 2024 race, head to the NPR Network's live updates page.