YORK, ENGLAND - MAY 23: Boris Johnson MP addresses members of the public in Parliament St, York during the Brexit Battle Bus tour of the UK on May 23, 2016 in York, England. Boris Johnson and the Vote Leave campaign are touring the UK in their Brexit Battle Bus. The campaign is hoping to persuade voters to back leaving the European Union in the Referendum on the 23rd June 2016. (Photo by Christopher Furlong/Getty Images)
