David Cameron could face push to oust him after EU referendum
The Tory civil war on Europe intensified as David Cameron was put on notice he faces a leadership challenge after the EU referendum.
More than 50 MPs are ready to move against the Prime Minister, according to prominent backbencher Andrew Bridgen.
Breaking ranks to talk openly of a bid to topple the Prime Minister, Mr Bridgen warned that anger in the Tory party was now so intense a challenge was "probably highly likely" as he warned the alternative was a "zombie parliament".
Asked if a vote of no confidence against Mr Cameron would happen, the MP told BBC Radio Five's Pienaar's Politics: "It depends how the next few weeks go, but if true to form, I think there's at least 50 colleagues dissatisfied with the way the Prime Minister has put himself front and centre of a fairly outrageous Remain campaign. That's probably highly likely."
The MP insisted the situation was now so dire an emergency general election would be needed before Christmas to restore order.
"I think it's going to be very, very difficult to pull all the sides together and have a working majority going forward," he said.
Nadine Dorries, a long-term critic of Mr Cameron, branded the PM an "outright liar".
The Mid-Bedfordshire MP said she had already sent a letter to the chairman of the backbench 1922 committee, the usual route for urging a leadership contest.
Ms Dorries told ITV's Peston on Sunday: "If the Remain campaign wins by a large majority, I'd say it would have to be 60-40, then David Cameron might just survive, but if Remain win by a narrow majority, or if Leave, as I certainly hope, will win, he's toast within days."
Pro-Leave Cabinet minister Chris Grayling insisted the push to oust the PM did not have the 50 signatures needed to trigger a contest.
He told Pienaar's Politics: "I don't think there are 50 colleagues gunning for the Prime Minister. I can assure you that those people who fought to win their seats 12 months ago are definitely not gunning for a general election by Christmas."
The in-fighting erupted after Brexit heavyweights Michael Gove and Boris Johnson launched an unprecedented attack on the Prime Minister's authority as they accused him of a having a "corrosive" impact on public trust in politicians because he had not lived up to promises to cut immigration.
The Office for National Statistics estimates 330,000 more people arrived in the UK in 2015 than left, despite the Government pledging to get the figure below 100,000.
Number 10 said the Brexit attacks were an attempt to "distract" from a survey of 600 economists showing 88% believed withdrawal would be damaging for the economy.
Employment Minister Priti Patel also launched a pointed swipe against Remain campaign leaders Mr Cameron and George Osborne, even though she did not directly name them in an article for the Telegraph website.
"It's shameful that those leading the pro-EU campaign fail to care for those who do not have their advantages. Their narrow self-interest fails to pay due regard to the interests of the wider public," Ms Patel wrote.