MANAMA, BAHRAIN - DECEMBER 07: British Prime Minister, Theresa May (C) attends a plenary session on the second day of the Gulf Cooperation Council summit, on December 7, 2016 in Manama, Bahrain. Prime Minister May is meeting Gulf leaders during the annual two-day Gulf Cooperation Council where she has discussed regional issues including the situations in Yemen and Syria and the perceived regional threat posed by Iran.  (Photo by Carl Court/Getty Images)