KNUTSFORD, UNITED KINGDOM - MARCH 17:  In this photo illustration, the sun sets behind European Union and the Union flag 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 illustration by Christopher Furlong/Getty Images)