Foreign Secretary William Hague has denied being embarrassed that 114 Conservative MPs voted in favour of an amendment to the Queen's speech, insisting it was a "free vote".
He added that the "whole [Conservative] party would like to be able to proceed with legislation" for an EU referendum, but that it was constrained by its Lib Dem coalition partners.
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.