Dan Mitchinson: US correspondent on Democrats calling for Biden to end his re-election campaign for President

Joe Biden is continuing to insist on staying in the presidential race, despite escalating calls for him to end his re-election campaign.  Four more Democrats currently in Congress have voiced their belief that Biden needs to step down during a recent phone call. US correspondent Dan Mitchinson says it's unclear who could replace Biden at this point in the campaign.  "You have the other Democrats who are saying - okay, that would mean Kamala Harris would have to step up and slide into the role vacated by Biden. But she just doesn't have the it-factor." LISTEN ABOVE  See omnystudio.com/listener for privacy information.