Extracts from a speech that David Cameron was planning to make this morning have been released by Downing Street.
In it, the Prime Minister said that he wanted Britain to have a place in the European Union, but warned that unless issues are resolved, the British public will drift away.
If we don't address these challenges, the danger is that Europe will fail and the British people will drift towards the exit.
I do not want that to happen. I want the European Union to be a success and I want a relationship between Britain and the EU that keeps us in it.
Centrica's boss warns an EU referendum risks "total destabilisation" for businesses; the Next chief suggests that view is "scaremongering."
There will be sympathy, yes. But will they agree with him? No.
Conservative MPs said their "achievable" proposals to change Britain's role in Europe do not represent an ultimatum to the Prime Minister.