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RIYADH, SAUDI ARABIA - MAY 21 : (----EDITORIAL USE ONLY MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. - Gulf Summit opens its session with the attendance of U.S. President Donald Trump and heads of state at King Abdul Aziz International Conference Center in Riyadh, Saudi Arabia May 21, 2017. The meeting is attended by leaders of Saudi Arabia, Qatar, Kuwait, Bahrain, the Crown Prince of Abu Dhabi and Omans deputy prime minister. (Photo by BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT/Anadolu Agency/Getty Images)

RIYADH, SAUDI ARABIA - MAY 21 : (----EDITORIAL USE ONLY  MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. - Gulf Summit opens its session with the attendance of U.S. President Donald Trump and heads of state at King Abdul Aziz International Conference Center  in Riyadh, Saudi Arabia May 21, 2017. The meeting is attended by leaders of Saudi Arabia, Qatar, Kuwait, Bahrain, the Crown Prince of Abu Dhabi and Omans deputy prime minister.  (Photo by BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT/Anadolu Agency/Getty Images)