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Negotiated approach also total dede-nuclearization and second of all, generals in my experience have the best understanding of how awful war is, at times more than civilians, do you think these generals, mcmaster in particular, are not so pessimistic, degrees of optimism how a war with north korea could unfold in a way that would not be catastrophic? >> reporter: well, to your second point, that's kind of what worries me is that generals do know what war is like and they have a real understanding of what war on the korean peninsula would be like what north korea has, they could throw not just ...

Nuclear program in north korea. what we got with patience is in launching of ballistic missiles. >> we all have to survive w. rehere. there is still a korean peninsula. >> if you trust, if people believe they can trust kim jong-un, he said he would use his weapons. i believe him. that's why we have to make sure he doesn't have that ability. >> reporter: and those weapons would likely be used first on our south korean allies. >> most of the enemy forces are located here. >> reporter: as defense secretary james mattis was reminded when he recently visited the demilitarized zone. mattis did his b...