Can Biden be replaced as nominee? Not so easily

Knives are out for Joe Biden after his poorly received performance in the first 2024 presidential debate against Donald Trump.

With November's election bearing down, some Democrats are calling on the president to step aside due to concerns about his mental fitness.

Five House Democrats have publicly broken ranks and four more did so on a private call on Sunday.

Mr Biden was defiant about staying in the race when he spoke at several public events and sat down for an interview with ABC News in recent days.

Unless he...