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WASHINGTON, DC - MAY 13: Crown Prince Mohammed bin Nayef of Saudi Arabia looks on in the Oval Office at the White House May 13, 2015 in Washington, DC. The Saudi delegation is meeting with U.S. President Barack Obama and Vice President Joe Biden as part of this week's meetings with delegations from the Gulf Cooperation Council. (Photo by Olivier Douliery - Pool/Getty Images)

WASHINGTON, DC - MAY 13:  Crown Prince Mohammed bin Nayef of Saudi Arabia looks on in the Oval Office at the White House May 13, 2015 in Washington, DC. The Saudi delegation is meeting with U.S. President Barack Obama and Vice President Joe Biden as part of this week's meetings with delegations from the Gulf Cooperation Council. (Photo by Olivier Douliery - Pool/Getty Images)