Biden defends his campaign as swing-state Democrat calls for him to exit race – as it happened

Angie Craig of Minnesota asks Biden to step aside', as California governor stumps for president in Pennsylvania. This blog is now closed

• Full story: Biden says only Lord almighty' could make him drop out

Biden's career worst debate performance against Trump last month has triggered acrimony, angst and panic among Democrats just four months from election day.

There are growing calls for oldest president in US history to step aside in favour of Vice-President Kamala Harris or another candidate. But Biden has so far dug in and vowed to fight on.