MORE Tory MPs are expected to join the growing list calling on the Prime Minister to resign over the partygate scandal.

Boris Johnson has been under mounting pressure over allegations of lockdown-breaking gatherings in Downing Street and across Whitehall and for his handling of the limited report on them published by senior civil servant Sue Gray on Monday.

Of the 16 events Ms Gray looked into, a dozen are being probed by Scotland Yard.

Mr Johnson is alleged to have attended as many as six of the gatherings under investigation.

Chancellor Rishi Sunak acknowledged today that partygate had damaged public trust in the government, while adding that the Prime Minister still enjoyed his “full support.”

Mr Sunak denied knowing anything about lockdown-breaking get-togethers in the Downing Street garden, saying that he didn’t spend all his time “staring out of his window behind me.”

A host of Tory MPs have confirmed that they have submitted letters of no confidence in Mr Johnson’s leadership to the 1922 Committee of Conservative backbenchers.

The latest three letters came on Wednesday. One of them, from senior Tory Tobias Ellwood, who chairs the Commons defence committee, said that it was time to resolve this matter as the party was “slipping into a very ugly place.”

Former special adviser Anthony Mangnall and veteran backbencher Gary Streeter submitted the other two.

Other Tories known to have submitted letters include Scottish Tory leader Douglas Ross, Sir Roger Gale, Andrew Bridgen and Peter Aldous.

More are expected to follow suit after having publicly called on Mr Johnson to go. They include former chief whip Andrew Mitchell, Aaron Bell, David Davis and committee chairs Caroline Nokes and William Wragg.

Mr Davis said today that he would consult his constituency party before acting, but he vowed to “recommend that we send in a letter.”

Trade minister Penny Mordaunt has reportedly written to a member of the public saying that she was “shocked at the stupidity of what has taken place,” adding: “I want to be assured of proper oversight, competence and integrity in how Downing Street is operating. It is critical to a functioning government and the trust of the public.”

And top Johnson aid Munira Mirza resigned today, condemning the Prime Minister for his “inappropriate” attack on Labour leader Sir Keir Starmer over disgraced disc jockey Jimmy Savile.

Ms Mirza, head of the No 10 policy unit, quit following Mr Johnson’s decision to invoke a right-wing conspiracy theory about the Labour leader’s role in allegedly failing to prosecute Savile while Sir Keir was head of public prosecutions.