Craig Oliver, Prime Minister David Cameron's director of communications, in Downing Street in London on July 13, 2016. Theresa May will become Britain's second ever female prime minister on Wednesday July 13, 2016, when David Cameron steps down after a seismic referendum to leave the European Union that sent shockwaves round the world and wrecked his career. / AFP / OLI SCARFF (Photo credit should read OLI SCARFF/AFP/Getty Images)

Craig Oliver, Prime Minister David Cameron's director of communications, in Downing Street in London on July 13, 2016.
Theresa May will become Britain's second ever female prime minister on Wednesday July 13, 2016, when David Cameron steps down after a seismic referendum to leave the European Union that sent shockwaves round the world and wrecked his career. / AFP / OLI SCARFF        (Photo credit should read OLI SCARFF/AFP/Getty Images)