Senior Labour MPs have called for Jeremy Corbyn to resign as tensions within the party rise over whether Britain should join airstrikes on Syria.
It comes after the party leader told MPs in a letter that he could not support military intervention against the so-called Islamic State in the country, sparking a furious backlash from shadow cabinet members who had not yet agreed their position on the matter.
Speaking to BBC Radio 5 Live, former minister John Spellar said Mr Corbyn's behaviour over the vote had been "unacceptable".
It's absolutely right for him to put that view in the shadow cabinet. It's right for them to discuss it.
They thought they were going away to resume that discussion on Monday. He's now trying to pre-empt that and whip up a storm inside the party.
Certainly... they should not resign. They should hold on to those places. If anyone should resign after this incident, it should be Jeremy Corbyn.
Another former minister, Fiona Mactaggart, echoed his sentiments - despite saying she was not convinced by the case for bombing either. Speaking to BBC Radio Berkshire, she said:
[Corbyn] hasn't got a strategy to lead the party from where it is to where it needs to be and the people of the country can see that. I think it probably is unsustainable.
I think [quitting] would be a sensible strategy because I think that the division at the moment is causing real problems.
David Cameron has urged Labour MPs to back plans for the RAF to join airstrikes in Syria, saying they should "do the right thing" and "vote on the basis of the arguments".
Labour leader Jeremy Corbyn sparked a furious backlash from MPs when he announced that he could not support military intervention, despite the shadow cabinet not having agreed a position on the issue.
Frontbenchers including shadow education secretary Emily Thornberry have warned that Corbyn faces a rebellion if he tries to whip MPs into voting with him.
Speaking in Malta ahead of a Commonwealth summit, the Prime Minister encouraged wavering MPs to support his motion, saying he believed there was a "compelling case" to take "effective action" in Syria.
I thought many Members of Parliament on all sides of the House of Commons yesterday agreed there was a compelling case, so I would urge all of them to vote on the basis of the arguments for effective action on a compelling case to keep our country safe.
Vote on those arguments and we can do the right thing.
Shadow foreign minister Hilary Benn has said he will not resign from Labour's front bench - despite backing airstrikes in Syria, opposing the position taken by leader Jeremy Corbyn.
It comes after Mr Corbyn provoked a backlash from Labour MPs by saying he could not support the military action, despite the shadow cabinet not reaching an agreed position.
Benn spoke to BBC R4's Today programme this morning, after admitting yesterday there was a "compelling" case for joining coalition airstrikes against the so-called Islamic State militant group in Syria.
Diane Abbott, the shadow international development secretary, has said that she does not believe that the prime minister has made a strong case for airstrikes against Islamic State militants in Syria.
She told ITV News that was not convinced that David Cameron had shown that military action in the war-torn country would make Britain safer.
The Labour MP for Hackney North and Stoke Newington said it had been known for months that some Labour MPs supported airstrikes, but that the question was how the majority of MPs would vote when they saw the evidence.
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