Will Trump walk away from the Iran nuclear deal?

President Trump has long denounced the Iran nuclear deal, most recently at the UN summit. But is he willing to leave it? As Trump faces a deadline to recertify Iran’s compliance with the 2015 accord, Rob Malley, a lead negotiator on the agreement, and Stephen Rademaker, a state department staffer under George W. Bush, talk with Judy Woodruff about what would happen if the president walks away.