Being admitted to hospital with coronavirus could cost President Donald Trump re-election, according to Britain’s former ambassador to Washington.

Lord Darroch said Mr Trump's brush with the virus will remind American voters of how badly he has managed the pandemic.

The former ambassador, who resigned from his role in 2019 after emails were leaked in which he called the Trump administration “clumsy and inept”, said that with US politics so polarised, the news of Mr Trump testing positive for the virus would focus the remaining weeks of the campaign on his handling of the crisis.

“I think it’s probably just in sort of cold calculating terms of the election, it’s probably a very bad thing for the president,” Lord Darroch said.

READ MORE: Timeline of Donald Trump’s Covid diagnosis – from tweet revelation to hospital stay

“One because it keeps the virus – because he’s caught it – on the front pages and the lead story for at least another couple of weeks and maybe longer if that’s how long it takes to recover.

“He doesn’t want the narrative to be about coronavirus because the polls will tell you most Americans think he has not handled it well.

“He wants the narrative to be about the ultra-left, radical-left Democrats and Joe Biden and as he would say a weak leader who will not be able to control them.

“It will remind people of the particular view that Donald Trump took over the pandemic and how it has turned out.

“So, it’s bad for him.”

Lord Darroch said that Mr Trump has recovered politically from previous setbacks, such as the Access Hollywood scandal in which a tape was published just weeks before the 2016 election of him talking about assaulting women.

“If he springs from his hospital bed like Superman in about five or six days’ time and is back on the campaign trail that will remind people of his terminator-like indestructibility and that could play for him but I’d be very surprised if that’s actually what happens,” he said.

“I think it’s more likely that you will not see any more debates and you wouldn’t see very much of President Trump before election day.”

READ MORE: Donald Trump feeling ‘much better’ amid confusion over condition

Lord Darroch, who was speaking at the Cheltenham Literature Festival to promote his new book Collateral Damage: Britain, America, And Europe In The Age of Trump, said if November’s election was as close as 2016 and Mr Biden was narrowly ahead, Mr Trump would take legal action.

“There’s lots of outrage in America when he refuses to say that he will definitely go if he loses the election,” he said.