Questions surround President Joe Biden’s run for re-election this November. After an underwhelming performance in the first debate with Republican rival Donald Trump, calls for the incumbent to step aside and let somebody else stand as the Democratic candidate have grown louder within the party. With concerns over the president’s fitness for office hanging like a cloud, we look at whether or not the Democrats could nominate an alternative candidate without his agreement, and examine some of the contenders who could potentially enter the fray.

Host Caitríona Perry speaks with the BBC's US Special correspondent Katty Kay and North America correspondent Anthony Zurcher about the president’s fight to stay on his party’s ticket.

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This episode was made by Tom Kavanagh and Alice Aylett Roberts. The technical producers were Mike Regaard and Jack Graysmark. The assistant editor is Sergi Forcada Freixas and the senior news editor is Sam Bonham.