Labour leader Ed Miliband has mocked David Cameron's stance on an EU referendum.
He told MPs that the Prime Minister was trying to appease the divisions in his own party, rather than acting in the interests of the nation.
Mr Miliband accused the PM of having a "hokey cokey weekend".
Three days, three positions. First it was no, then it was yes, then it was maybe.
Has there been a change in the Government's position, yes or no?
A nudge, nudge, wink, wink European policy is neither good for the country nor will it keep his party quiet.
Former defence secretary Liam Fox has said that the UK should leave the European Union unless there is a rebalancing of their relationship.
Foreign Secretary Hague said there would be a "very, very powerful" case for a referendum if Europe moved towards a more federal system.