LONDON (AP) — Britain’s prime minister said today he will offer citizens a vote on whether to leave the European Union if his party wins the next election, prompting warnings from fellow member states about the soundness of such a move.

Claiming that public disillusionment with the 27-nation EU is “at an all-time high,” David Cameron used a longawaited speech in central London to say that the terms of Britain’s membership in the bloc should be revised and the country’s citizens should have a say.

Cameron proposed today that his Conservative Party renegotiate the U.K.’s relationship with the European Union if it wins the next general election, expected in 2015.

“Once that new settlement has been negotiated, we will give the British people a referendum with a very simple in or out choice to stay in the EU on these new terms. Or come out altogether,” Cameron said. “It will be an in-out referendum.”

EU member states, which in the run-up to the speech stressed the importance of Britain’s presence in the bloc, took a sharper tone after Cameron spoke.

Martin Schulz, the president of the European Parliament, said Cameron was playing “a dangerous game,” accusing him of trying to appease his increasingly anti- European Union party and shore up support.

“This was an inward-looking speech that does not reflect European reality and will not impress many of the U.K.’s European partners,” Schulz said. “The speech was more about domestic politics.”

Much of the criticism directed at Cameron has accused him of trying an “a la carte” approach to membership in the bloc and seeking to play by some but not all of its rules.

French Foreign Minister Laurent Fabius warned today that a British withdrawal from the EU would be dangerous for both the bloc and Britain.

“Say that Europe is a soccer club. You join this soccer club, but you can’t say you want to play rugby,” he told France-Info radio.