Iranian nuclear scientist Mohsen Fakhrizadeh was killed near Tehran, Iran on Friday. Fakhrizadeh was said to be Iran’s most senior nuclear scientist and has been described by diplomats as the “father of the Iranian bomb.” Iranian media is reporting that Fakhrizadeh was ambushed by four attackers. Host Carol Hills speaks with Abas Aslani, a senior research fellow at the Center for Middle East Strategic Studies, which is based in Tehran.