Boris Johnson’s position is now “untenable”, according to the first Conservative MP to say the prime minister should resign since he was fined for breaking his own Covid laws.

       Backbench Tory Nigel Mills said: “I don’t think the PM can survive or should survive breaking the rules he put in place … He’s been fined, I don’t think his position is tenable.”

       Mr Mills, MP for Amber Valley, said people were “rightly angry” over parties. “When they were observing the very strictest of the rules, people who were making the rules didn’t have the decency to observe them.”

       He also told BBC Radio Derby that “we have to have higher standards than that of people at the top” – saying he “dreads to think” how many more fines could be issued.

       However, Mr Mills added: “It’s pretty clear he’s not going to resign, and I would be very surprised if there were 180 of my colleagues that wanted to change prime minister at this stage.”

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       Mr Johnson looked set to avoid an initial fallout from becoming the first prime minister to be hit with criminal sanctions while in office over a law-breaking birthday bash held for him at No 10.

       The PM, his wife and the chancellor Rishi Sunak have all paid fines imposed by the Metropolitan Police over a party held on 19 June 2020 to mark Mr Johnson’s 56th birthday.

       Cabinet ministers, including Liz Truss, Dominic Raab, Michael Gove, Nadine Dorries and Sajid Javid, tweeted in support of Mr Johnson, praising his leadership and pointing to the ongoing challenge of the Ukraine war.

       But Mr Mills said he is “not convinced” by the argument that it is not the right time for a change in leadership in the UK, given the crisis in Ukraine.

       The backbencher said: “I have two comments on that. The first one is, when will Ukraine be any better than it is now? If you told me this crisis would be over in three months’ time, then you might say, ‘Well OK, let’s get this done (then) the prime minister can meet his fate’.”

       Veteran Tory MP Sir Roger Gale, a vocal critic of Mr Johnson, said now was not the time to unseat him during the Ukraine war. He said “history would not forgive us” if the PM was replaced during an international crisis.

       But Sir Roger said that while he thought Johnson had “effectively misled the House of Commons” and “is clearly going to have to be held to account”.

       Scottish Tory leader Douglas Ross echoed his colleagues’ sentiments, saying it “wouldn’t be right” to remove the PM “at this time” during the Russian invasion of Ukraine.

       Tory MP Andrew Bridgen, who recently withdrew his letter of no-confidence on Mr Johnson, said it was not the time for a leadership challenge. But he warned: “This is not the end of this matter.”

       Tory peer Baroness Ruth Davidson did speak out against Mr Johnson, however, saying he “broke the rules he imposed on the country and lost the moral authority to lead. He should go”.

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       Lord Frost, the former Brexit minister, told LBC he did not think that “one fixed penalty notice is itself grounds for resignation” – backing Mr Johnson to lead the Tory party into the next election.

       But the Tory peer said the PM had to come to Commons to correct his comments. “The prime minister is on record saying to parliament that all the rules were observed and there were no parties – that’s obviously not the case.”

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       Ben Houchen, the influential Tory mayor of Tees Valley, also defended the PM. He said the public “recognise he’s a flawed individual … he wears that on his sleeve. And that makes him more human to a lot of people”.

       A YouGov poll found that 57 per cent of voters thought Mr Johnson should resign, while 75 per cent said he had knowingly lied.