Donald Trump said Americans were praying for the health of Boris Johnson after the Prime Minister was admitted to intensive care.

The US President was speaking at the White House as he held a daily press briefing on the coronavirus crisis.

"I also want to send best wishes to a very good friend of mine, a friend to our nation, Prime Minister Boris Johnson. We were very saddened to hear that he was taken into intensive care this afternoon," the president said.

"Americans are all praying for his recovery. He's been a really good friend. He's been really something very special - strong, resolute, doesn't quit, doesn't give up."

Trump said he asked "genius" drug companies to "contact London" immediately after news of the PM's condition emerged.

"We'll see if we can be of help...we've contacted all of Boris's doctors, and we'll see what is going to take place," Mr Trump said.

Prime Minister Boris Johnson with US President Donald Trump in 2016

"When you're brought into intensive care, it gets very, very serious," he added.

Johnson was moved to the ICU at St. Thomas's hospital at around 7pm after experiencing breathing difficulties which required him to be given oxygen.

Messages of support have flooded in for the PM as he battles the disease which has killed thousands in Britain since the beginning of the outbreak.

Mr Johnson is in intensive care after his condition deteriorated
Trump made the comments as he held a daily briefing at the White House (File image)

French President Emmanuel Macron also sent his support to " Boris Johnson, his family and the British people", adding that he hoped the PM "would overcome this ordeal quickly."

Former Prime Minister David Cameron tweeted: "Thinking of @BorisJohnson and his family tonight. Get well soon. You are in great hands and we all want you safe, well and back in @10DowningStreet."

It was reported that the Queen is 'being kept informed' of Boris Johnson's condition after the PM was admitted to intensive care this evening.

Buckingham Palace source said: “Her Majesty has been kept informed by No10.”

Professor Derek Hill, professor of medical imaging, University College London (UCL), said it was "very likely" Mr Johnson would be put on a mechanical ventilator in intensive care.

Carrie Symonds was unable to be by the Prime Minister's side as he was admitted to intensive care

He said: "It seems clear that the Prime Minister went to hospital because he had difficulty breathing. It seems he was initially put on oxygen, and was conscious.

"But as often happens with Covid-19, his condition has now deteriorated so he has been admitted to intensive care where he is very likely to have been put on a mechanical ventilator to breath for him."

Foreign Secretary Dominic Raab will "deputise where necessary", a Number 10 spokesman said.

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Boris Johnson in intensive care

A Number 10 spokesman said: "Over the course of this afternoon, the condition of the Prime Minister has worsened and, on the advice of his medical team, he has been moved to the intensive Care Unit at the hospital.

"The PM has asked Foreign Secretary Dominic Raab, who is the First Secretary of State, to deputise for him where necessary.

"The PM is receiving excellent care, and thanks all NHS staff for their hard work and dedication."