Max Hastings, a former editor of Boris Johnson during his time as a journalist, has described the Mayor of London as "utterly chaotic".
Interviewed for a documentary about Johnson, to be screened by the BBC tomorrow night, Hastings said: "Supposing he became Prime Minister, the idea of Boris Johnson's finger on the nuclear button ... one day he would get it mixed up with the one to call the maid"
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.