The Chief Secretary to the Treasury Danny Alexander has told the commons that the Liberal Democrats will "use all their influence" to ensure that Britain remains part of the European Union.
"The position of this Government was made very clear in the Coalition Agreement and confirmed again in the Mid-Term Review document published at the beginning of this year, which is that we wish to maintain British membership of the European Union" Mr Alexander said.
"During this parliament we will exercise our influence to the utmost to win the arguments in Britain's national interest in favour of jobs, investment and growth in this country."
Cameron has pledged to back a Conservative MP's EU referendum bill, as Cable labelled the move potentially 'damaging' for the country.
114 Conservative backbenchers have voted in favour of a eurosceptic motion to amend the Queen's Speech in defiance of the Prime Minister.
David Cameron has denied he has buckled under pressure from his backbench MPs over the EU debate.