Cameron to give strongest warning over possible EU exit

By Michael Holden and William James LONDON (Reuters) - Prime Minister David Cameron will this week give his strongest warning yet that he might back Britain leaving the EU unless other European leaders agree to his demands for reform of the bloc. Cameron is due to outline British demands for renegotiation of its European Union membership terms in a letter to the President of the European Council, Donald Tusk, to be published on Tuesday. In a speech the same day, he will say that if no deal can b