Riyadh, Rajab 14, 1437, Apr 21, 2016, SPA -- President Barack Obama of the United States expressed thanks to and appreciation of the Custodian of the Two Holy Mosques King Salman bin Abdulaziz Al Saud and the leaders of the Gulf Cooperation Council (GCC) Member States for devoting their time to make today's GCC-U.S. summit a success. This came in a press conference made by the US president following a conclusion of the GCC-US Summit in Riyadh. --More 18:54 LOCAL TIME 15:54 GMT www.spa.gov.sa/w