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BRUSSELS, BELGIUM - FEBRUARY 19:  An Exit sign stands in the main atrium during the second day of the EU Summit as British Prime Minister David Cameron continues his attempts to negotiate new membership terms for the UK, on February 19, 2016 in Brussels, Belgium. Most of Europe's 28 member state leaders have gathered in Brussels to take part in a crucial summit and vote on British Prime Minister David Cameron's pledge to renegotiate the terms of Britain's membership in the EU, namely proposals to limit benefits for migrant workers. A referendum on whether Great Britain will stay in or leave the European Union is to be held before the end of 2017, though many expect it to take place in June this year. arrives during the second day of the EU Summit as British Prime Minister David Cameron continues his attempts to negotiate new membership terms for the UK, at the Council of the European Union on February 19, 2016 in Brussels, Belgium. Most of Europe's 28 member state leaders have gathered in Brussels to take part in a crucial summit and vote on British Prime Minister David Cameron's pledge to renegotiate the terms of Britain's membership in the EU, namely proposals to limit benefits for migrant workers. A referendum on whether Great Britain will stay in or leave the European Union is to be held before the end of 2017, though many expect it to take place in June this year.  (Photo by Dan Kitwood/Getty Images)
BRUSSELS, BELGIUM - FEBRUARY 19:  An Exit sign stands in the main atrium during the second day of the EU Summit as British Prime Minister David Cameron continues his attempts to negotiate new membership terms for the UK, on February 19, 2016 in Brussels, Belgium. Most of Europe's 28 member state leaders have gathered in Brussels to take part in a crucial summit and vote on British Prime Minister David Cameron's pledge to renegotiate the terms of Britain's membership in the EU, namely proposals to limit benefits for migrant workers. A referendum on whether Great Britain will stay in or leave the European Union is to be held before the end of 2017, though many expect it to take place in June this year. arrives during the second day of the EU Summit as British Prime Minister David Cameron continues his attempts to negotiate new membership terms for the UK, at the Council of the European Union on February 19, 2016 in Brussels, Belgium. Most of Europe's 28 member state leaders have gathered in Brussels to take part in a crucial summit and vote on British Prime Minister David Cameron's pledge to renegotiate the terms of Britain's membership in the EU, namely proposals to limit benefits for migrant workers. A referendum on whether Great Britain will stay in or leave the European Union is to be held before the end of 2017, though many expect it to take place in June this year.  (Photo by Dan Kitwood/Getty Images)

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With a looming referendum on EU membership, Former Conservative Party Leader Michael Howard (pro-Brexit) and Historian Timothy Garton Ash (anti-Brexit) debate.

U.K. faces the question: Should I stay or should I go?

With a looming referendum on EU membership, Former Conservative Party Leader Michael Howard (pro-Brexit) and Historian Timothy Garton Ash (anti-Brexit) debate.