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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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    Former MI6 head: EU enhances UK security, doesn't impede

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Former MI6 head: EU enhances UK security, doesn't impede

Former British Intelligence chief John Sawers tells Christiane Amanpour why he thinks staying in the EU enhances the UK's security and economic interests.

Former MI6 head: EU enhances UK security, doesn't impede

Former British Intelligence chief John Sawers tells Christiane Amanpour why he thinks staying in the EU enhances the UK's security and economic interests.