Boris Johnson “should be long gone”, a senior Tory backbencher has declared during a key parliamentary debate on partygate.

Steve Baker had only two days ago offered the prime minister his backing after he apologised in the Commons following his fine for breaking lockdown rules.

Mr Baker revealed his change of heart as MPs discussed whether to order an investigation into whether the prime minister misled them over partygate.

Politics live: Surprise U-turn ahead of debate on partygate inquiry

Shortly before the debate, the government dropped its bid to delay the vote – which was brought by Labour and supported by other opposition parties.

Mr Baker said he believed that Mr Johnson’s “marvellous contrition… only lasted as long as it took to get out of the headmaster’s study”.

“I have to acknowledge that if the prime minister occupied any other office of senior responsibility… he would be long gone,” he said.

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“The prime minister now should be long gone. The prime minister should just know the gig’s up.”

Labour has tabled a motion to refer Mr Johnson to the privileges committee over his initial claims that no lockdown rules had been broken.

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0:55

‘Due process’ must be followed on partygate

Conservative MPs had earlier been told to support an amendment delaying a vote on such a motion until after separate investigations by the police and civil servant Sue Gray.

Education Secretary Nadhim Zahawi, speaking to Sky News, predicted that Tory colleagues would back that move, describing it as “the right thing to do”.

But Conservative members were later told they would have a free vote – and the amendment has been dropped.

A spokeswoman for the PM said Mr Johnson had been involved in the decision, adding: “We are now content that any parliamentary process would take place after both the Met investigation and after the Sue Gray report had been published.”

But Labour said it was “humiliating” for the Conservatives.

Earlier, the prime minister – speaking on a visit to India – urged MPs to wait until they have “the full facts” and for investigators to “do their stuff and then knock this thing on the head”.

He has also vowed to fight the next election as Tory leader.

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0:42

‘Majority of people believe PM lied’

Sir Keir Starmer, tabling the motion to order a parliamentary investigation, said Mr Johnson had “stood at the despatch box and point-blank denied rule breaking took place – when it did”.

“As he did so he was hoping to gain extra protection from our good faith, that no prime minister would ever deliberately mislead this House,” Sir Keir added.

“He’s used our faith, our conventions, to cover up his misdeeds.

“After months of denials, of absurd claims that all the rules were followed, of feigned outrage at his staff discussing rule breaking, we now know the law was broken.

“We know the prime minister broke the law and we know that he faces the possibility of being found to have broken it again and again and again.”

William Wragg, a Conservative MP who has previously described the PM’s position as untenable, told the Commons: “Much I may have tried, I cannot reconcile myself to the prime minister’s continued leadership of our country and the Conservative party.”

He said it was “utterly depressing to keep being asked to defend the indefensible”.

SNP leader Ian Blackford said: “The prime minister of the United Kingdom is a liar. I genuinely don’t say that lightly and I don’t say it loosely.”

Pressure on Mr Johnson over partygate has resumed since he was fined last week for attending a gathering on his birthday in June 2020 – in breach of lockdown laws.

He is also thought to have attended some of the other 12 events in Downing Street and Whitehall in 2020 and 2021 being investigated by the Metropolitan Police.

In a recent update on the investigation, the Met said it had referred more than 50 fixed penalties to be issued.

Scotland Yard said on Thursday that it would not be providing further updates on the probe until after local elections on 5 May.

The government have shifted priority on partygate – and it’s significant

Sam Coates

Deputy political editor

@SamCoatesSky

What just happened in the Commons matters – even if it’s not immediately obvious. The government have changed their priority.

Until 11.15 am, Number 10’s priority was to avoid another investigation into Boris Johnson. The government was proposing a vote on a motion that would delay the decision on whether or not to have a probe into whether the PM lied for weeks until the conclusion of the police work and Sue Gray report. This was a plan to kick the can down the road. But it required Tory MPs to actively support it in the voting lobbies.

At 11.15 am, government tactics changed. They decided their priority was to avoid any kind of vote at all. Instead, they will allow the probe to go ahead, supported by all sides “on the nod” – meaning that MPs will not be asked to go through the division lobbies.

This is presumably because the priority has become avoiding any kind of vote that may reveal the scale of Tory MP’s discomfort. Perhaps it suggests Tory MP support for the PM is lower than they would want to make public. Tory whips will instead presumably try and put pressure on the four Tories on the committee, who outnumber opposition MPs more than two to one, to make sure

The inference of what’s happened is that the Tory Parliamentary Party is less supportive of Mr Johnson than they want to show publicly. The PM of course, can’t tell because he’s in India. But this isn’t something you can hide for long.