Following a recent GOP presidential candidate debate during which an electromagnetic pulse attack was discussed, NPR’s Guy Raz talked with Noah Shachtman, who writes on national security for Wired magazine, about this potential national security threat.

The last question of the debate was: What national security issue do you worry about that nobody is asking about? Answers ranged from socialist rebels to communist China to cyber attacks to joblessness. But Newt Gingrich mentioned a threat that has not been talked about this campaign season: an electromagnetic pulse attack.

Hear the story from NPR.