Joe Biden is said to be in 'denial' about having to withdraw from the presidential election following his dismal debate performance last week, as some of his campaign donors become ever more worried about his mental acuity.

The 81-year-old commander-in-chief has insisted he is staying in the race amid calls from members of his own party to step aside and hand the reins over to a younger Democrat.

But even those who are publicly vouching for Biden have admitted in private that there is no path forward with him at the top of the ticket, according to the Washington Post.

A donor adviser has now estimated that 'for every 10 people who think he should exit, one thinks he should stay.'

Others have suggested that even Biden knows on some level that he is doomed.