Trump, and first lady Melania, are self-isolating after testing positive in the early hours of Friday, following a positive test from one of his closest aides.
White House aide Hope Hicks returned a positive test on Thursday.
Tonight, @FLOTUS and I tested positive for COVID-19. We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!— Donald J. Trump (@realDonaldTrump) October 2, 2020
He joins Boris Johnson on the list of world leaders who have been infected with the coronavirus.
Boris Johnson, who fell gravely ill after catching COVID-19 in March, wished the couple to a speedy recovery.
My best wishes to President Trump and the First Lady. Hope they both have a speedy recovery from coronavirus.— Boris Johnson (@BorisJohnson) October 2, 2020
Speaking on Sky News, housing secretary Robert Jenrick said: “All of us want to send our best wishes to President Trump, the first lady and the Trump family and wish them a speedy recovery.
“We know what it’s like to have, in our case a prime minister who tested positive for COVID, and setting aside politics we all want to see him and his wife get better soon.
Jenrick added that the United States has a clear succession protocol should it be needed.
Watch: President Trump and first lady test positive for coronavirus
“In the US they’ve got a very clear protocol haven’t they, with the vice president, should that be necessary,” Jenrick added.
Other British MPs have also sent messages of support to Trump, including former Chancellor Sajid Javid, who urged people to put politics aside.
I wish Donald and Melania Trump a speedy recovery from this awful virus. Our politics is not relevant.— Sajid Javid (@sajidjavid) October 2, 2020
Trump is thought to be at higher risk of hospital admission from COVID-19 due to his age, gender and weight.
The 74-year-old falls into the high risk group because he is male – with men around twice as likely to die from coronavirus as women.
However, his biggest risk factor is his age, with experts concluding that age is by far the strongest predictor of an infected person’s risk of dying.
The US Centres for Disease Control and Prevention says people aged 65 to 74 have a five times higher risk of hospital admission with coronavirus compared with those aged 18 to 29.
For people aged 75 to 84, the risk of needing hospital admission jumps to eight times higher, with a 220 times higher risk of death.
Trump’s doctor, Sean Conley, told reporters in June that he is healthy. Conley also reported that Trump weighed 17st 6lb (110.7kg).
While waiting for the results of his test, Trump said he had found it difficult to socially distance while meeting members of the armed forces.
He told Fox News: “It’s very hard when you’re with soldiers, when you’re with airmen, when you’re with the marines, and with the police officers, I’m with them so much.
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Watch: Trump is in a high risk category of COVID-19 patients