Asked about modern warfare, Ben Carson waxed apocalyptic about exoatmosphere nuke attacks.

Here he is on the threats America faces: 

“Now we have dirty bombs, and we have cyber attacks, and we have people who will be attacking our electrical grid. ... They can do these things simultaneously. We have enemies obtaining nuclear weapons they can explode in our exoatmosphere, and destroy our nuclear grid.” 

The thread of an electromagnetic pulse produced by an atmospheric nuclear explosion seemed to weigh especially heavily on Carson’s mind. He invited the audience to imagine a situation where enemies deployed an “electromagnetic pulse, and then they hit us with a cyber attack simultaneously.” It doesn’t get much worse than a cyber attack while electricity is down, as our computers are never more vulnerable than when they’re totally nonfunctional.