It comes as a book reveals Donald Trump admitted he “played down” the risk of the virus earlier.

The risk of dying from coronavirus “doubles every six years”, Professor Sir David Spiegelhalter, a statistician at the University of Cambridge, has said.
“A 20-year-old has double the risk of a 14-year-old,” he told the BBC, adding: “It’s like a horrible form of compound interest.”
“The real danger points, in a sense, are intergenerational meetings. At the moment, the people who are getting the virus are the 20-29s – if 5,000 get it, there may be one death if you’re unlucky, there will be other sort of long-term conditions as well.
“But if 5,000 people my age – 67 – get it, there would be about 75 deaths, and for people older, in their 80s, it would be 10 times that many.
“So it shows the crucial care is where the generations meet, and I think what this shows is that, for the young, anyone over 55 should be treated with caution, respect, in terms of masks and the distance and so on.”
‘Huge danger’
Spiegelhalter also said Boris Johnson’s “Operation Moonshot” project – which would see millions of UK-wide tests carried out daily – could lead to hundreds of thousands of people being unnecessarily labelled as having coronavirus.
“Statisticians are just sort of banging their heads on the wall at this, because mass screening always seems like a good idea in any disease – ‘Oh yes, let’s test everybody’. But the huge danger is false positives – no tests are perfect, it is not a simple yes/no thing.”