LONDON, UNITED KINGDOM – MARCH 17: In this photo illustration, the European Union and the Union flag are pictured on a pin badge on March 17, 2016 in London, 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 Dan Kitwood/Getty Images)
