ROME, ITALY - JULY 27: The shoes of Italian Prime Minister Matteo Renzi and British Prime Minister Theresa May after arrived at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande. (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27: The shoes of Italian Prime Minister Matteo Renzi and British Prime Minister Theresa May after arrived at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande.  (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27: Italian Prime Minister Matteo Renzi receives British Prime Minister Theresa May as she arrives at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande. (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27: Italian Prime Minister Matteo Renzi receives British Prime Minister Theresa May as she arrives at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande.  (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27: Italian Prime Minister Matteo Renzi receives British Prime Minister Theresa May as she arrives at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande. (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27: Italian Prime Minister Matteo Renzi receives British Prime Minister Theresa May as she arrives at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande.  (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27: Italian PM Matteo Renzi and UK PM Teresa May attend a press conference at the end of their meeting at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande. (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27:  Italian PM Matteo Renzi and UK PM Teresa May attend a press conference at the end of their meeting at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande.  (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27: Italian PM Matteo Renzi rand UK PM Teresa May attends a press conference at the end of their meeting at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande. (Photo by Franco Origlia/Getty Images)

ROME, ITALY - JULY 27:  Italian PM Matteo Renzi rand UK PM Teresa May attends a press conference at the end of their meeting at Villa Pamphili, on July 27, 2016 in Rome Italy. Theresa May became British Prime Minister 2 weeks ago, after David Cameron resigned following the referendum vote to leave the EU. May is currently undertaking a tour of the Europe to speak to the leaders of major EU countries, and has already met with German Chancellor Angela Merkel and French President Francois Hollande.  (Photo by Franco Origlia/Getty Images)