Wendy Sherman, lead negotiator for the 2015 nuclear deal, assesses the challenges ahead for current U.S. efforts to end the conflict with Iran.

NPR's Ailsa Chang talks with Wendy Sherman, the lead U.S. negotiator on the 2015 Iran nuclear agreement, about the road ahead for U.S. negotiators aiming to strike a new deal to end the Iran war. <p>NPR's Ailsa Chang talks with Wendy Sherman, the lead U.S. negotiator on the 2015 Iran nuclear agreement, about the road ahead for U.S. negotiators aiming to strike a new deal to end the Iran war.</p><img src="https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=nx-s1-5858933" />