A growing number of senior Democrats are throwing their support behind Kamala Harris to become the party's presidential nominee, after Joe Biden dramatically quit the race. The US president withdrew from November's election on Sunday, having faced weeks of calls to step aside following a calamitous TV debate against Republican opponent Donald Trump. President Biden immediately endorsed his vice president as his favoured candidate, who says she intends to "earn and win" the nomination.

In this episode, James Reynolds is joined by former BBC Washington correspondent Nick Bryant and special correspondent Jim Naughtie for their reaction. And the BBC's US special correspondent Katty Kay also drops in to give her assessment of how this impacts campaigning for both parties.

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This episode was made by Laurie Kalus, Richard Moran and Alice Aylett Roberts. The assistant editor is Sergi Forcada Freixas and the senior news editor is Richard Fenton-Smith.