What’s Behind the Standstill in US-Iran Nuclear Talks?

The United States in February offered to rejoin nuclear talks with Iran who declined leaving the idea of new negotiations in limbo. Iran says the U.S. needs to drop sanctions imposed by the previous administration before talks can commence. FOX’s Trey Yingst speaks with Dr. Raz Zimmt, Iran expert at the Institute for National Security Studies, about obstacles facing renegotiating of a nuclear deal.