The PM’s health deteriorates but he remains conscious and has asked Foreign Secretary Dominic Raab to deputise for him.
The prime minister was admitted to St Thomas’ Hospital in London on Sunday night – 10 days after testing positive for coronavirus – due to his continuing “persistent” symptoms of COVID-19.
He was initially admitted for further tests but Mr Johnson’s health has since deteriorated, Number 10 said.
The prime minister has asked Foreign Secretary Dominic Raab to deputise for him “where necessary”, a request that was made before Mr Johnson was moved to intensive care.
The Queen has been kept informed of the developments by Downing Street, a Buckingham Palace source told Sky News.
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.