Dominic Cummings is preparing a bombshell dossier that will attempt to blame the prime minister for thousands of deaths during the pandemic, according to reports.
The former top aide will give evidence to a joint committee of MPs investigating the government’s response to the coronavirus crisis next month.
According to the Sunday Times, Mr Cummings will use the appearance to launch a fresh attack on Boris Johnson.
A source told the paper: “Dominic has copies of everything and knows where all the bodies are buried.
“He was pushing the prime minister hard to lock down sooner in the autumn and he has lots of evidence that shows that his decision to delay led to devastating consequences.”
Downing Street is also concerned that Mr Cummings might expose details about Mr Johnson’s life with fiancee Carrie Symonds.
Last night Mr Cummings suggested the government was too slow to close the borders when the pandemic started.
He said the scientific consensus that travel bans would not help prevent the spread of Covid-19 was flawed.
In response to a tweet about how Vietnam had protected its borders he said it was a “very important issue re learning from the disaster”.
His tweet followed a lengthy blog post where he openly attacked Mr Johnson and claimed that the manner in which he obtained funding for the refurbishment of his Downing Street flat was “unethical” and “possibly illegal”.
Mr Cummings claimed Mr Johnson had attempted to secure funding from Conservative supporters for £58,000 worth of renovations to the flat he shared with Ms Symonds.
The prime minister said on Friday he had personally paid back the money.
Mr Cummings also accused Mr Johnson of trying to block an inquiry that implicated Henry Newman, a friend of Ms Symonds, after details of the autumn lockdown were leaked to the press.
The blog post came after Mr Johnson blamed Mr Cummings for leaking texts he sent to James Dyson regarding a tax waiver.
Jeremy Hunt, the chairman of one of the committees that will question Mr Cummings told the Sunday Telegraph that MPs would would publish whatever the former Downing Street aide gave them as long as it did not put national security at risk and as long as the MPs on the committee agree.
Mr Hunt said: “We will publish whatever he gives us – we would have to check if it passes any tests.”
Downing Street insiders have no idea the extent of the material Mr Cummings claims to have and say they are “terrified” about further revelations.
One source said there is extreme nervousness about an apparent “treasure trove” of embarrassing documents that Mr Cummings might seek to get published.
Mr Cummings quit 10 Downing Street last November after an apparent power struggle involving Ms Symonds.
A formal investigation has been launched into Boris Johnson's refurbishment of his Downing Street flat after a watchdog found "reasonable grounds to suspect that an offence or offences may have occurred".
The Electoral Commission on Wednesday announced they would look into whether any transactions related to the works on the prime minister's flat, above 11 Downing Street, were properly reported.
It follows days of questions over how and when Mr Johnson's refurbishment of his flat was funded.
In leaked emails, it has emerged that Tory donor Lord Brownlow offered the Conservative Party a £58,000 donation last year.
The money, according to emails seen by the Daily Mail, was to "cover the payments the party has already made on behalf of the soon to be formed 'Downing Street Trust'".
In the emails to Conservative Party officials from October, the Tory peer was also reported to have mentioned a £15,000 donation.
However, only the £15,000 donation has been listed on Electoral Commission records, with mystery surrounding the other £58,000 sum.
It has been confirmed that the government has, since last spring, been looking into whether a trust could be established to help fund upgrades of the prime minister's residence in Downing Street, with Lord Brownlow having agreed to be its chair.
But no such trust currently exists and Mr Johnson is now said to have "personally" paid for the costs of a "wider refurbishment" of the flat he shares with his fiancee Carrie Symonds.
Yet both Number 10 and the Conservative Party have not denied reports that Conservative Campaign Headquarters paid the Cabinet Office to cover initial costs of the works.
An Electoral Commission spokesperson said: "We have been in contact with the Conservative Party since late March and have conducted an assessment of the information they have provided to us.
"We are now satisfied that there are reasonable grounds to suspect that an offence or offences may have occurred. We will therefore continue this work as a formal investigation to establish whether this is the case.
"The investigation will determine whether any transactions relating to the works at 11 Downing Street fall within the regime regulated by the Commission and whether such funding was reported as required.
"We will provide an update once the investigation is complete. We will not be commenting further until that point."
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