U.S. President Barack Obama has met Saudi Arabia's King Salman in Riyadh, for talks aimed at tackling a raft of thorny issues currently complicating bilateral relations.
The nuclear deal with Iran, the fight against terrorism and the potential release of long-awaited congressional documents relating to 9/11, threaten to damage relations further.
Nina-Maria Potts has more from Washington:
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President Obama is set to meet his counterparts from the Gulf Cooperation Council on Thursday- in a bid to repair relations with the Gulf monarchies.
But there's been anger in the region over comments President Obama has made recently to the U.S. media.
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