Joe Biden became the Democratic Party's indisputable presidential nominee Monday when Bernie Sanders paid a surprise visit to the former vice president's livecast and issued an unexpected and full-throated endorsement.

Sanders, who formally suspended his campaign last week, said he needed everyone - not just his supporters - to back Biden and make sure that President Trump becomes a one-term president.

"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, to make certain that we defeat somebody who I believe is the most dangerous president in the modern history of this country," Sanders told Biden.

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