Is a return to the Iran nuclear deal imminent?

After 16 months of negotiations, Iran has responded to the EU's plan to restore the 2015 nuclear deal. All sides are waiting for the US to reply. So what are the final hurdles to a new agreement? Join host Laura Kyle.  Guests: Mohammad Marandi - Adviser to Iranian negotiation team. Hamidreza Azizi - Visiting Fellow, German Institute for International and Security Affairs. Alex Vatanka - Director and Senior Fellow, The Middle East Institute.