Advance extracts of UK PM Cameron speech - will "rule nothing out" with EU

Reuters report on advance extracts of British Prime Minister David Cameron's speech due Tuesday

"If we can't reach such an agreement, and if Britain's concerns were to be met with a deaf ear, which I do not believe will happen, then we will have to think again about whether this European Union is right for us," Cameron will say, according to advance extracts of his speech.

"As I have said before -- I rule nothing out."

Cameron wants concessions and reforms in his negotiations with the EU ahead of the 'Brexit' referendum

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Cameron is to send a letter to the President of the European Council, Donald Tusk, which will be published on Tuesday. Cameron gives his speech the same day.