The Australian Foreign Editor Greg Sheridan says Joe Biden is “unbelievably stubborn”.

The first debate between US President Joe Biden and his predecessor Donald Trump was held last week.

“It’s too late [to change the Democrat’s presidential candidate] unless he [Joe Biden] agrees,” Mr Sheridan told Sky News host Andrew Bolt.

“In all this, we mustn’t underestimate Biden.

“Biden is unbelievably stubborn and, in a way, quite skilful.”