Number 10 on Private Members' Bill: David Cameron is "very happy" James Wharton has taken on EU referendum draft legislation and will give it the Conservative party's "full backing".
Tory MPs will be given a three line whip to support the Private Members' Bill on it passage through Parliament.
But Downing Street are unable to guarantee the Bill will be given government time for its passage through Parliament because Nick Clegg disagrees with the Prime Minister on the issue.
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.