LONDON, ENGLAND - JUNE 27: Former US President Bill Clinton speaks at the inaugural Walkabout Foundation gala at Natural History Museum on June 27, 2015 in London, England. (Photo by David M. Benett/Getty Images for the Walkabout Foundation)
LONDON, ENGLAND - JUNE 27: Former US President Bill Clinton speaks at the inaugural Walkabout Foundation gala at Natural History Museum on June 27, 2015 in London, England. (Photo by David M. Benett/Getty Images for the Walkabout Foundation)