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U.S President Barack Obama (R) holds a bilateral meeting with Crown Prince Mohammed bin Nayef and Deputy Crown Prince Mohammed bin Salman(L) of Saudi Arabia in the Oval Office of the White House May 13, 2015 in Washington, DC. (Photo by OLIVIER DOULIERY/WHITE HOUSE POOL (ISP POOL IMAGES)/Corbis/VCG via Getty Images)

U.S President Barack Obama (R) holds a bilateral meeting with Crown Prince Mohammed bin Nayef and Deputy Crown Prince Mohammed bin Salman(L) of Saudi Arabia in the Oval Office of the White House May 13, 2015 in Washington, DC.   (Photo by OLIVIER DOULIERY/WHITE HOUSE POOL (ISP POOL IMAGES)/Corbis/VCG via Getty Images)