nonnuclear bomb on afghanistan against isis and underground tunnels. joining me now is william mccomb. a former senator and advisor to president the right decision, the right use of that weapon? >> i think it was. i think he's taking advice from his commander in the field and also secretary mattis. so i think they had a specific target. this was the right weapon for that target. and it's an indication that we have more powerful weapons. we have one even more powerful than that. but nonetheless, i think he's deferring to the tactical decisions to be made by the commanders in the field, and it's good thing. >> let's talk about north korea. we were talking to one of your other predecessors, and this is what he had to say about the use of force against north korea preemptively. >> there's a reason n u.s.