US Democrats are discussing whether Joe Biden can continue as the party's presidential candidate in the wake of his halting display in a televised election debate with Donald Trump. We speak to Jaime Harrison, chair of the Democratic National Committee.Also in the programme: Millions of Iranians vote in a presidential election; and a new electric car battery which charges in under five minutes.(Photo: Composite photo of Democratic Party presidential candidate, US President Joe Biden (R) and Republican presidential candidate, former US President Donald Trump (L) speak during a presidential debate in Atlanta, Georgia, 27 June 2024. Credit: Brian SnyderReuters)