BERLIN, GERMANY - JULY 20: Theresa May, Prime Minister of the United Kingdom, speaks during a press conference with German Chancellor Angela Merkel (unseen) on July 20, 2016 in Berlin, Germany. The two leaders discussed their upcoming cooperation together as well as the United Kingdom's withdrawing of its membership from the European Union, known as Brexit. (Photo by Adam Berry/Getty Images)

BERLIN, GERMANY - JULY 20:  Theresa May, Prime Minister of the United Kingdom, speaks during a press conference with German Chancellor Angela Merkel (unseen) on July 20, 2016 in Berlin, Germany. The two leaders discussed their upcoming cooperation together as well as the United Kingdom's withdrawing of its membership from the European Union, known as Brexit.  (Photo by Adam Berry/Getty Images)

BIRMINGHAM, ENGLAND - OCTOBER 09: Footwear worn by Home Secretary Theresa May as she delivers her speech to the Conservative party conference in the International Convention Centre on October 9, 2012 in Birmingham, England. Today's penultimate day of the annual, four-day Conservative party conference features speeches from Cabinet ministers and the Mayor of London. (Photo by Oli Scarff/Getty Images)

BIRMINGHAM, ENGLAND - OCTOBER 09:  Footwear worn by Home Secretary Theresa May as she delivers her speech to the Conservative party conference in the International Convention Centre on October 9, 2012 in Birmingham, England. Today's penultimate day of the annual, four-day Conservative party conference features speeches from Cabinet ministers and the Mayor of London.  (Photo by Oli Scarff/Getty Images)

LONDON, ENGLAND - JULY 07: British Home Secretary and Conservative leadership contender Theresa May's shoes as she poses outside the Houses of Parliament on July 7, 2016 in London, England. Theresa May has the backing of 199 fellow MPs after the second ballot for the leadership of the Conservative Party. Receiving 84 votes, Andrea Leadsom MP joins May on the shortlist presented to the Conservative Party members after Michael Gove was eliminated with 46 votes. (Photo by Jack Taylor/Getty Images)

LONDON, ENGLAND - JULY 07: British Home Secretary and Conservative leadership contender Theresa May's shoes as she poses outside the Houses of Parliament on July 7, 2016 in London, England. Theresa May has the backing of 199 fellow MPs after the second ballot for the leadership of the Conservative Party. Receiving 84 votes, Andrea Leadsom MP joins May on the shortlist presented to the Conservative Party members after Michael Gove was eliminated with 46 votes. (Photo by Jack Taylor/Getty Images)

BIRMINGHAM, ENGLAND - OCTOBER 09: Leopard-print footwear worn by Home Secretary Theresa May at the Conservative party conference in the International Convention Centre on October 9, 2012 in Birmingham, England. Today's penultimate day of the annual, four-day Conservative party conference features speeches from Cabinet ministers and the Mayor of London. (Photo by Oli Scarff/Getty Images)

BIRMINGHAM, ENGLAND - OCTOBER 09:  Leopard-print footwear worn by Home Secretary Theresa May at the Conservative party conference in the International Convention Centre on October 9, 2012 in Birmingham, England. Today's penultimate day of the annual, four-day Conservative party conference features speeches from Cabinet ministers and the Mayor of London.  (Photo by Oli Scarff/Getty Images)

A picture shows the shoes of Britain's Home Secretary Theresa May as she addresses delegates on the third day of the annual Conservative party conference in Manchester, north west England, on October 6, 2015. AFP PHOTO / OLI SCARFF (Photo credit should read OLI SCARFF/AFP/Getty Images)

A picture shows the shoes of Britain's Home Secretary Theresa May as she addresses delegates on the third day of the annual Conservative party conference in Manchester, north west England, on October 6, 2015. AFP PHOTO / OLI SCARFF        (Photo credit should read OLI SCARFF/AFP/Getty Images)