Joe Biden has reportedly become more open in recent days to hearing arguments that he should step aside as the Democratic presidential candidate after the party’s two main congressional leaders told him they doubted his ability to beat Donald Trump.

While continuing to insist he will be the party’s nominee in November, the president has reportedly started asking questions about negative polling data and whether Vice-President Kamala Harris, considered the favourite to replace him if were to withdraw, fares better.

The indications of a possible rethink come after Biden tested positive on Wednesday for Covid-19, forcing him to isolate for several days while curtailing a campaigning visit to Nevada that had been part of a drive to show his candidacy was very much alive.

It also coincides with fresh polling data showing that he now trails Trump by two points in Virginia, a state he won by 10 points in 2020.