No, he's full of it.
Any war on the Korean peninsula would roughly follow OPLAN 5027.
Part of that is the deployment of more than a half million US troops to South Korea.
So tell me, have any of your families who have members serving in the military spoken of mass last-minute deployments overseas?
No?
Then Trump's bluffing.
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And don't think the North Korean spies in South Korea haven't noticed the lack of activity to match his talk.