The nuclear deal recently negotiated with Iran faces a final hurdle in Congress before it can be implemented. Republicans and a handful of Democrats have committed to passing a law that would revoke President Barack Obama’s ability to provide some of the sanctions relief promised to Iran as part of the agreement reached on July 14. As the vote, expected in the Senate during the second week of September, draws closer, there is building momentum within the Democratic Party to preserve the nuclear accord, making it increasingly unlikely that Congress will have the votes to kill the deal.