As members of Congress debate whether to back the deal over Iran's nuclear program, one source of support seems guaranteed -- China. It's one of the biggest winners in the agreement, with the lifting of sanctions as Iran pulls back key elements of its enrichment program set to allow Beijing to deepen its historic partnership with Tehran. While China is undoubtedly eyeing the potential economic benefits, Beijing also likely sees an opportunity to challenge U.S. influence in the Middle East.




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