LONDON - Nearly half of Britons would vote in a referendum to leave the European Union and less than a third to stay in, according to a poll highlighting divisions facing Prime Minister David Cameron.

Polling company YouGov said on Thursday 49 percent favored leaving the EU, 28 percent would vote to stay in the 27-nation bloc, 17 percent were undecided and the rest would not vote.

The British leader is under growing pressure from rebels within his party to take a tougher stance with Brussels when he attends EU budget talks later this month.

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