Wouldn’t it also be as likely that North Korea would send a nuclear device in a shipping container hidden in other cargo or on a ship equipped with a short range launch system where they would have greater assurance of a successful attack?
There many possibilities and those are certainly among them. While such an attack localized at a port on the East or West coast would be very bad, an EMP attack affecting all of CONUS would be far worse and far more difficult to recover from. None of The Above would, obviously, be best. What, however, can and will our own Dear Leader do to increase the probabilities of None of the Above?