"In a statement released to the Guardian, Corbyn said: “Labour should set out its own clear position to influence negotiations, working with our European allies to set out a reform agenda to benefit ordinary Europeans across the continent. We cannot be content with the state of the EU as it stands. But that does not mean walking away, but staying to fight together for a better Europe.”
Corbyn made clear that he intended to campaign for reform from within the EU after Phil Wilson and Pat Glass, the two MPs who chair the parliamentary Labour party’s 100-strong pro-EU group, wrote to him asking that he make clear whether he supported EU membership. Corbyn had declined at a leadership hustings last week to rule out campaigning for a no vote on the grounds that David Cameron was intent on “trading away workers’ rights” in his EU negotiations.
In their letter, Wilson and Glass wrote: “We believe it is incumbent on you to state clearly to the party membership, and more importantly to the country, your position on membership of the EU before the ballot papers are despatched in August. We believe you need to make your position clear too: if you are leader of the Labour party, would you campaign to remain in the EU, yes or no?” "