Here is an article that discusses what the broadcast was all about. Electromagnetic Pulse or EMP.
Thanks Johnny for following up on this issue. There can be no doubt this is a valid threat. Iran or any other radical government with the same limited brain power, freakish mindset would take this action against America in a nano-second if they possessed the capability.
Meanwhile, we pussy-foot allowing Iran to develop the device...Israel is nearly "at the end of their rope" as they're the first target or perhaps the second after a EMP action against America.......