The former mayor of New York Michael Bloomberg criticises President Trump at the Democratic Convention.
BBC reporters with the presidential campaigns deliver their verdicts on Biden, Sanders and Bloomberg.
The ex-mayor of New York suffers a series of defeats - but insists he's the man to beat the president.
By Mike Hills
The way Democrats pick a nominee takes months, costs a fortune and doesn't even lead to high turnout.
By Anthony Zurcher
North America reporter