The article made reference to the challenges such an attack would pose, as a reason some discount the possibility of a EMP attack. I don’t know what they are - just wondered if someone did.
I read Newt’s original article on the subject a couple of months ago, and I believe he mentioned it would “only” take 2 or 3 nuclear warheads exploding hundreds of miles above the U.S. to have these devastating consequences. Maybe the powers that be think it would be a significant challenge for our enemies to come up with that, but I don’t see why.