A spokesman for the Conservative party has described Nadine Dorries' suggestion of running on a joint Tory-UKIP ticket in the next election as "not party policy".
"It's not going to happen," he added.
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.