On November 12th, a massive explosion decimated a missile-testing site near Tehran and killed General Hassan Tehrani Moghaddam, the head of Iran's missile program. While the cause remains unknown, this explosion is a major setback for the development of long-range missiles. It also comes on the heels of an announcement by Iranian officials that they have shot down a U.S. predator drone. David Sanger, Chief Washington Correspondent for our partner The New York Times and host of WQXR's The Washington Report, speaks about this incident and Iran's nuclear program at large.