US President Joe Biden, in his first TV interview since withdrawing from the election, has said he acted under pressure from fellow Democrats and out of a determination to see Donald Trump beaten.
Kamala Harris's late entry into the White House race has galvanized young Democrats, a group whose participation will be crucial if the party hopes to defeat Donald Trump in November.
Harris won the support of 99% of the delegates who signed petitions in the party's nominating contest.
From former presidents to current lawmakers, Biden's party faithful rallied around him as he passed the torch to Vice President Kamala Harris, endorsing her to take on Donald Trump.
Biden's withdrawal from the US election offers Democrats the precious opportunity for a late reset in a campaign that was going badly but ushers in an uncertain few weeks.
Biden has acknowledged he had a poor performance against Trump during the 90-minute nationally televised faceoff.