Joe Biden has issued a warning to his critics to challenge him at the upcoming Democratic National Convention. Anthony and Miles answer criticism on whether the BBC focus too much on the president’s cognitive abilities.

And with momentum building behind the idea of Kamala Harris taking over from Biden, we answer your questions on why she has been largely absent from the campaign so far.

HOST: Anthony Zurcher, North America Correspondent

GUEST: Miles Taylor, former chief of staff at Department for Homeland Security

GET IN TOUCH: * Join our online community: https://discord.gg/qSrxqNcmRB * Send us a message or voice note via WhatsApp to +44 330 123 9480 * Email Americast@bbc.co.uk * Or use #Americast

US Election Unspun: Sign up for Anthony’s new BBC newsletter: https://www.bbc.co.uk/news/world-us-canada-68093155

This episode was made by George Dabby with Catherine Fusillo. The technical producer was Jonny Hall. The series producer is Purvee Pattni. The senior news editor is Sam Bonham.