The 77-year-old is making a second attempt, launching his campaign to be Democratic candidate in 2020 and believes he still has what it takes to win the White House. He's described Donald Trump as the most dangerous president in modern American history.
The list for the Democratic primary looks a crowded one and one of the most diverse ever. At least 12 candidates have confirmed they'll run so far - dozens more have still to decide.
There are already a record number of women, vast age differences between candidates, and ethnic minorities. But have any of them got what it will take to face up to Trump?
Presenter: Hashem Ahelbarra | Guests: Jeffrey Stacey - Former State Department Official in the Obama Administration; Adam Quinn - Senior Lecturer in American Politics, University of Birmingham; Rina Shah - Republican Strategist and Consultant
