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LONDON, ENGLAND - MAY 15: President of Turkey Recep Tayyip Erdogan is greeted by Queen Elizabeth II during a private audience at Buckingham Palace on May 15, 2018 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 15: President of Turkey Recep Tayyip Erdogan is greeted by Queen Elizabeth II during a private audience at Buckingham Palace on May 15, 2018 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)