LONDON, ENGLAND - MAY 09: Former Mayor of London Boris Johnson delivers a 'Vote Leave' speech on May 9, 2016 in London, England. Mr Johnson laid out his case for 'Brexit' to journalists. Earlier today during a European Union (EU) speech at the British Museum, British Prime Minister David Cameron warned that if Britain left the European Union it would put peace and stability on the continent at risk. (Photo by Dan Kitwood/Getty Images)
