Former US presidential hopeful Bernie Sanders has endorsed Joe Biden’s campaign to take on Donald Trump in November’s election.
Senator Sanders pulled out of the contest to be the Democratic Party’s nominee last week, leaving Mr. Biden as the only remaining candidate.
In a live split-screen webcast, former vice-president Mr. Biden thanked his former rival for the endorsement.
Senator Sanders urged all Americans to unite to defeat Mr. Trump.
He described him as “the most dangerous president in the modern history of this country”.
“Today I am asking all Americans – I’m asking every Democrat, I’m asking every independent, I’m asking a lot of Republicans – to come together in this campaign to support your candidacy which I endorse,” Mr. Sanders, 78, said.
“It’s imperative that all of us work together.”
Mr. Biden, 77, said he was “deeply grateful” for the endorsement and said he needed Mr. Sanders not just for the campaign, but to govern.
“You’ve put the interests of this nation and the need to beat Donald Trump above all else. As you say – ‘Not me, us’,” he said.