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KNUTSFORD, UNITED KINGDOM - MARCH 17:  In this photo illustration, the European Union and the Union flag sit together on bunting on March 17, 2016 in Knutsford, United Kingdom. The United Kingdom will hold a referendum on June 23, 2016 to decide whether or not to remain a member of the European Union (EU), an economic and political partnership involving 28 European countries which allows members to trade together in a single market and free movement across its borders for citizens.  (Photo by illustration by Christopher Furlong/Getty Images)
KNUTSFORD, UNITED KINGDOM - MARCH 17:  In this photo illustration, the European Union and the Union flag sit together on bunting on March 17, 2016 in Knutsford, United Kingdom. The United Kingdom will hold a referendum on June 23, 2016 to decide whether or not to remain a member of the European Union (EU), an economic and political partnership involving 28 European countries which allows members to trade together in a single market and free movement across its borders for citizens.  (Photo by illustration by Christopher Furlong/Getty Images)

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    If UK votes to leave EU, then what?

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If UK votes to leave EU, then what?

Former NATO Secretary General Anders Fogh Rasmussen and former Polish Foreign Minister Radek Sikorski talk to Christiane Amanpour about the potential impact of a Brexit on the EU.

If UK votes to leave EU, then what?

Former NATO Secretary General Anders Fogh Rasmussen and former Polish Foreign Minister Radek Sikorski talk to Christiane Amanpour about the potential impact of a Brexit on the EU.