One pollster said: ‘Hillary was ahead before the last election and we all know how that turned out, but Biden has double the lead she had at this point.

‘The race is Biden’s to lose, but Trump is the Houdini of politics and if anyone can pull off an upset then it’s him.’

However, a source within the White House last night painted a gloomy picture for the incumbent. ‘Most people accept it’s over. We’ve all got other jobs lined up,’ the insider said. ‘At this point, the only person in the White House who thinks Donald Trump can win is Trump himself.

‘But he’s a streetfighter and there is a small path to victory if he takes Florida and Pennsylvania. It’s unlikely but do-able.’