Now that the Corker-Cardin legislation has been adopted without poison pills attached, it is virtually certain that Congress will be unable to block President Obama’s ability to conclude and begin implementing a nuclear agreement with Iran that he believes meets U.S. requirements. The main domestic impediment to a deal lies in Iran. If negotiations are to be brought to a successful conclusion, Supreme Leader Khamenei must decide that he wants an agreement, that he is willing to make the hard choices necessary to achieve one, and that he is prepared to use his authority to bring Iranian critics on board.

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