LONDON, ENGLAND - JUNE 30: Home Secretary Theresa May speaks as she launches her bid to become the next Conservative party leader at RUSI Whitehall on June 30, 2016 in London, England. Nominations for MP s to declare their intention to run for the Conservative Party Leadership and therefore British Prime Minister will close by noon today. The current Prime Minister and party leader, David Cameron, announced his resignation the day after the UK voted to leave the European Union. (Photo by Jeff J Mitchell/Getty Images)

LONDON, ENGLAND - JUNE 30:  Home Secretary Theresa May speaks as she launches her bid to become the next Conservative party leader at RUSI Whitehall on June 30, 2016 in London, England. Nominations for MP s to declare their intention to run for the Conservative Party Leadership and therefore British Prime Minister will close by noon today.  The current Prime Minister and party leader, David Cameron, announced his resignation the day after the UK voted to leave the European Union.  (Photo by Jeff J Mitchell/Getty Images)