Alan Johnson, leader of the Labour Group's Yes campaign, says leaving the EU could put jobs as well as our rights at risk, while eurosceptic Tory MP John Redwood says far from losing friends, Britain will gain in stature as an independent country.
But who do you agree with? Should we stay or should we go?
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The President of the European Commission seized his opportunity to complain about his long working hours during the EU summit in Brussels.
The fundamental values of the EU are "non-negotiable", the president of the European Council has warned the UK.
Cameron is looking for EU reforms so significant it will require a treaty change that, if agreed, would not be in place before a referendum.