Mr Cameron says the coalition is working well but some of his MPs are not so sure Conservative MPs are to use a meeting with David Cameron to voice concerns about the coalition and what some argue are too many policy concessions.
Ahead of a meeting of the party’s backbench 1922 committee – which the PM will address – one Tory MP said the coalition could end by 2012.
Peter Bone said there could be an election once the economic crisis ended as “nobody had voted for a coalition”.
Some Tories have said the coalition could continue after the next election.
The two parties agreed to work together until May 2015, when the next general election is due to be held.
Mr Cameron and deputy prime minister and Lib Dem leader Nick Clegg have both insisted their parties will remain independent forces.
But former Prime Minister Sir John Major has been among those to suggest they should prolong their co-operation, saying last month the “temporary alliance” could turn into a “mini-realignment” of politics.
But talk of electoral pacts has angered some Conservative MPs who already believe their party has sacrificed too many of the policies it stood on in May to placate its coalition partners.
Mr Bone told BBC Radio 4’s Today programme the coalition should not continue indefinitely.
“I accept we need a coalition government until the economic crisis is over and we have dealt with it but that might be done within the next two years,” he said.
“Then I see no point in the coalition government at all.”
There could be an election as early as 2012 if the economy stabilised, Mr Bone suggested.
“I would prefer people to have the opportunity to say ‘do you want a Conservative government, a Labour government or a Liberal government?’ I don’t think anyone voted for a coalition.”
“It would not be wise for anyone to take Conservative backbenchers for granted in the way that they have been”
Nadine Dorries Conservative MP
Fellow Conservative MP Nadine Dorries told the same programme that “too much has been given away” by the Conservatives on issues such as Europe, immigration, defence and law and order.
“It would not be wise for anyone to take Conservative backbenchers for granted in the way that they have been,” she said.
“We have mainstream core Conservative principles that for the good of the coalition and the country we are suppressing but it would not be wise to think that that is a position that we want to continue with in the long term.”
Concerted efforts were being made to raise the prospect of the two parties fighting the election as a coalition, she suggested, with senior figures being “strategically placed” to talk up the possibility in the media.
“We are not idiots, we know what’s happening,” she added.
Tory MPs Nick Boles and Jacob Rees-Mogg have argued for an electoral pact with the Lib Dems but no ministers have endorsed the idea and the two parties will be fielding separate candidates at the Oldham East and Saddleworth by-election expected early next year.
Ministers say the two parties agreed to co-operate in the national interest, each side has had to make compromises on policy, and the coalition is continuing to function well.
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