"David Cameron has placed himself front and centre of a disingenuous Remain campaign, setting himself at odds with half of the Parliamentary Party and 70 per cent of our members and activists on the most important issue facing our Country in a generation… Whatever the result, I believe his position will be untenable," Bridgen said in an interview with The Telegraph daily.
He reiterated that Cameron’s future as Tory leader was in doubt "whether he wins or loses" the June 23 so-called Brexit referendum on Britain’s future within the European Union.
"If Remain win by a narrow majority or if lLeave – as I certainly hope, I think – will win he’s toast within days," Dorries stressed.
Fellow party member accuse the British leader and his allies of exploiting his position to scare voters into casting ballots in favor of remaining within the EU.
With slight variations, polls have indicated the Vote Remain camp holding a slight edge over Vote Leave since the rival campaigns officially kicked off in early April.
A number of national and foreign figures have since lobbied on behalf of Cameron, including the International Monetary Fund and US President Barack Obama.