At the start of the month, Donald Trump led Hillary Clinton by 56-31 per cent among white Catholics.

According to the latest poll, in the wake of the lewd video and sexual assault allegations against Mr Trump, Mrs Clinton has taken a 46-42 lead. Overall, the Catholic vote is 61-34 in her favour.

This is a major blow to Mr Trump's chances of pulling off a victory in three weeks time - in fact it could be fatal.