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CAIRO, EGYPT - APRIL 11: King Salman bin Abdulaziz Al Saud of Saudi Arabia (R) shakes hands with Egyptian President Abdel Fattah al-Sisi (L) before he leaves at Cairo International airport in Cairo, Egypt on April 11, 2016. (Photo by Pool / Egypt Presidency/Anadolu Agency/Getty Images)

CAIRO, EGYPT - APRIL 11: King Salman bin Abdulaziz Al Saud of Saudi Arabia (R) shakes hands with Egyptian President Abdel Fattah al-Sisi (L) before he leaves at Cairo International airport in Cairo, Egypt on April 11, 2016. (Photo by Pool / Egypt Presidency/Anadolu Agency/Getty Images)