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Saudi Defence Minister and Deputy Crown Prince, Mohammed bin Salman (R) walks with US Secretary of Defense Ashton Carter during the Gulf Cooperation Council (GCC) defence Ministrial summit in Riyadh, on April 20, 2016. / AFP / FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

Saudi Defence Minister and Deputy Crown Prince, Mohammed bin Salman (R) walks with US Secretary of Defense Ashton Carter during the Gulf Cooperation Council (GCC) defence Ministrial summit in Riyadh, on April 20, 2016. / AFP / FAYEZ NURELDINE        (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)