US President Donald Trump said on Sunday he was "hopeful and sure" that Britain's Prime Minister Boris Johnson, would make a recovery from the coronavirus.
The British prime minister was hospitalised for further coronavirus tests after testing positive last week.
"He is a friend of mine, he is a great gentleman, a great leader. He was brought to the hospital today but I am hopeful and sure that he is going to be fine," Trump said at his White House briefing.
"He is a strong man, a strong person."
British Prime Minister Boris Johnson, who has been in self-isolation for the past seven days after testing positive for coronavirus, was taken to hospital for further tests as a precaution.
Downing Street called it a "precautionary step" and it is understood his admission was not an emergency and he was taken to hospital on medical advice.
Johnson is the most high-profile world leader to contract the virus. His pregnant partner, Carrie Symonds, is also recovering from symptoms but has not been tested.