Dominic Cummings has accused Boris Johnson of lying after No 10 denied the prime minister was warned against allowing a "bring your own booze" party during the first lockdown.

Mr Cummings- who has been strongly critical of Mr Johnson since he left No 10- says the PM "waved aside" concerns about the gathering.

Mr Johnson has admitted he attended the event on 20 May 2020, but says he believed it was work-related.

no 10 spokesman said : "it is untrue that the prime minister was warned about the event in advance.

As he said earlier this week, he believed implicitly that this was a work event."

"He has apologised to the house and is committed to making a further statement once the investigation concludes."

Last week, Mr Johnson said he went to the gathering in the Downing Street garden and stayed at the drinks for 25 minutes to thank staff for their hard work.

However Mr Cummings, who worked in No 10 at the time of the party, has insisted Mr Johnson "knew he was at a drinks party cos he was told it was a drinks party and it was actually a drinks party".

He alleged that Mr Johnson's principal private secretary ( PPS ), Martin Reynolds, had sent out the email inviting 100 staff to "socially distanced drinks in the No 10 garden", but "a very senior official replied by email saying the invite broke the rules".

"The PPS went to the official's office where they discussed it.

i told the pps the invite by at least two people.

mr cummings claimed mr reynolds told him he would "check with the pm if he's happy for it to go ahead", on 20 may 2020.

"Amid discussion over the future of the cabinet secretary and PPS himself, which had been going on for days, I said to the PM something like : 'Martin's invited the building to a drinks party, this is what I'm talking about, you 've got to grip this madhouse '," he wrote.

Cummings added : "The PM waved it aside.

He said his account showed that "the PM lied to Parliament about parties".

SNP Westminster leader Ian Blackford said Mr Cummings was "a key witness" and should be interviewed by Sue Gray, the senior civil servant carrying out an inquiry into gatherings on government premises during Covid restrictions.

Another Conservative MP, Damian Collins, said the number of letters he has received from his constituents about the Downing Street party in May 2020 is "in the hundreds" and "a lot of people are very angry".

For a Conservative Party leadership contest to be triggered, 54 Conservative MPs must write to the chairman of the backbench 1922 Committee, Sir Graham Brady, to say they no longer have confidence in the prime minister.

On Sunday, former minister Tim Loughton became the sixth Tory MP to call on Mr Johnson to resign, saying his position was "untenable".

"[ The government is ] continuing to deliver on those policy priorities."

Sir Keir has said a picture of him drinking beer in an office last spring did not show a breach of Covid rules in place at the time.

"there is simply no comparison" over the image.

"Not only me but other eyewitnesses who discussed this at the time would swear under oath this is what happened."

what has been the reaction to these latest claims?

"I am sure he did check with the PM.

he claimed reynolds had checked with johnson whether the party should go ahead, the prime minister agreed it should and they both went to the party.

"The events of 20 May alone, never mind the string of other events, mean the PM lied to parliament about parties.

Pat McFadden, Labour's shadow chief secretary to the Treasury, said if Mr Cummings' claims are true, then the "tattered fig leaf" of the PM's defence that he thought the 20 May gathering was a "work event" will have been "blown apart".

But Cummings, a former senior aide to the prime minister, wrote a new blog post on Monday challenging that account.

I 'll say more when SG ’ s [ Sue Gray ’ s ] report is published."

The warning came after No 10 denied Mr Johnson was "warned about" a party, or that he told aides objecting to garden gathering that they were “ overreacting ”.

Many MPs believe Mr Johnson can not survive in office if it is shown that he misled parliament with his repeated denials that parties took place with his knowledge.

( I think it very likely another senior official spoke to the PM about it but I am not sure )," the post stated.

The former aide also attacked Downing Street briefings about a "drinking culture" in No 10, arguing it was false and “ intended to shift blame ”.

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