The Prime Minister has sought to rally the Conservative party around a private members' bill due to be discussed in the House of Commons today.
In an email to party activists last night he wrote:
As I made clear in my speech on Europe earlier this year, we want an in-out referendum by the end of 2017. And tomorrow Conservative MP James Wharton will propose a Bill that would write this commitment into law.
The Bill has my full support - and it has support from across the Parliamentary Party: ministers and backbenchers, Conservatives of all views. We are united behind it and together we will vote for it.
For decades, politicians have denied the British people a voice on Europe. Tomorrow the Conservative Party will fight to give them one. And let us all be proud of that.
More top news
A British scientist says the age women may be able to conceive children could soon be significantly extended.
Simon Cowell admitted he was "so embarrassed" after his shirt burst open during an X Factor audition.
Following the promise of further powers for Scotland, David Cameron is now talking about a new deal for the other home nations.