David Cameron has reaffirmed his commitment to remaining in the European Union, insisting Britain's ongoing membership helps it on the world stage.
MPs should be able to block EU laws outright if they are opposed by the Commons, William Hague is expected to argue later.
Britain is being taken to court over an extra test it imposes on migrant benefit claimants.
David Cameron has received a major boost from Barack Obama after the US president firmly backed his EU negotiations in their White House press conference.
Eurosceptic troublemakers have forced David Cameron into a reluctant equivocation which collapses under scrutiny. By refusing to listen to them, they are making him play a terrible political price.
Conservative backbenchers are preparing to defy their leader over the EU referendum in another sign of David Cameron's weakness on Europe.
Over 100 Conservative backbenchers have again expressed their displeasure with the prime minister's position on Europe, in another setback for David Cameron's authority.
David Cameron is addressing criticisms his EU referendum plans are creating uncertainty this week, as he takes the case for reform to European capitals.
When it comes to Europe, we need more Malcolm X than Malcolm R.
Size matters in diplomacy. If Britain is forced to go it alone in Europe, it will be an observer of world events - not a shaper of them.
An independent Scotland would have to apply for membership of the European Union, the SNP has conceded.
It was a speech worthy of the buildup. David Cameron's pledge for an in-out referendum on Europe has transformed the debate about the UK's relationship with the continent.
David Cameron has let domestic politics triumph over diplomacy. The closer you look at his EU referendum speech, the more it becomes clear his goal is winning power in 2015.
Hardline Conservative eurosceptics are gearing up to fight their party leader in the European Union in-or-out referendum, regardless of the negotiations with EU leaders to come.
The Lisbon treaty already gave national parliaments greater powers. So what exactly is Cameron fighting for?
Offering an in-out referendum on EU membership is the final capitulation to the growing euroscepticism which caused me to leave the Conservative party and join the Liberal Democrats.
If a grown-up baby were to hold a well-attended, much-reported speech to announce it had no choice but to throw all its toys out of the pram, and was preparing to give its teddy bears a vote on whether to leave the family unit altogether, it would look something like this.
Follow David Cameron's historic speech on an EU referendum with our live blog.
David Cameron's EU speech will hand the British people the chance to give their "fresh consent" to the UK's relationship with Brussels, William Hague has said.
Breaking every rule in British politics, Miliband showed you can make headway while defending the EU.
David Cameron's impending promise of a referendum on Europe is pitting Conservative claims of advancing Britain's "national interest" against Labour's warnings on the economy, today's prime minister's questions revealed.
David Cameron's frustrating Europe obfuscation can be traced back to his other big crisis on the issue: abandoning the Tories' "cast-iron guarantee" over the Lisbon treaty referendum.
Chancellor George Osborne has offered a defiant response to German and American warnings about a potential British exit from the EU.
Britain's special relationship with the US could be devalued if the UK left the European Union, a senior Obama administration official has warned.