Summary
Cameron has said he will back staying in the EU if a draft deal on Britain's future relationship published this week is agreed by other EU leaders, but many in his party, which is deeply divided over Europe, do not plan to back his position.
The internal rifts over Britain's involvement in the European Union have dogged the party for decades and contributed to the downfall of two previous Conservative prime ministers, Margaret Thatcher and John Major.
The EU's draft text addressed all four areas where Cameron wants reform.
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