The PM’s ex-aide is said to have a store of damaging evidence from his time inside Downing Street that could spell disaster for his old boss.
It has emerged Mr Johnson allegedly told advisers he was ruling out any more “f***ing lockdowns” after the second bout of restrictions in November, vowing to avoid them regardless of the number of ‘bodies’. No 10 denies the claim.
It comes amid a bitter spat between the PM and his former right-hand man, who had access to some of the most confidential information in government before he was booted out last year.
Mr Cummings is reportedly getting ready to present a bombshell dossier before the joint committee of MPs investigating the Government’s handling of the coronavirus crisis next month.
He is also said to have other embarrassing documents, memos and notes to hand.
A source told The Sunday Times: “Dominic has copies of everything and knows where all the bodies are buried”.
According to The Telegraph, Downing Street insiders are “terrified” and have “no idea how far-reaching the material will be”.
Insiders wonder why Johnson “put his finger inside the hornets nest” after No 10 accused Mr Cummings of leaking messages from Mr Johnson’s phone last week.
Mr Cummings tore into his former boss in the explosive fallout that followed.
In a seething online blog post, Mr Cummings claimed the Prime Minister had tried to stop an inquiry into the leak of plans for a second lockdown last year because it implicated a friend of his fiancee, Carrie Symonds.
No 10 denied this, saying: “The PM has never interfered in a government leak inquiry.”
In another explosive claim, Mr Cummings suggested the PM was prepared to risk breaking electoral law by asking donors to pay for the refurbishment of his Downing Street flat.
Mr Cummings claims he warned Boris Johnson against plans to have donors secretly pay for refurbishment of his Downing Street flat, saying it would be “unethical, foolish (and) possibly illegal”.
He questioned the PM’s “competence and integrity”.
Mr Cummings left No 10 in November after an apparent deterioration of relations with Mr Johnson.
The pair had been close allies on the Vote Leave campaign and Mr Cummings played a key role in the Tory election victory in 2019 and the early days of Mr Johnson’s premiership.
But he saw a sensational fall from grace after he broke lockdown restrictions last year by making a jaunt from London to County Durham and Barnard Castle. The Mirror revealed he had driven 300 miles while his wife had coronavirus symptoms.
Mr Cummings then gave a bizarre hour-long press conference in the Downing Street garden, where he claimed a trip to Barnard Castle from his family farm – where he should have been isolating – was to test his eyesight.