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a quick strike at NK
If it were Obama, or Bush, or Clinton, or Bush, or any other US president, you could reasonably expect this, should the circumstances absolutely demand it, with the appropriate backing (either explicitly or implicitly).
With Kim Jong Trump, who knows? A big strike, the biggest strike, we have nukular, the best nukalar, you see, and my friends, I have lots of friends, they tell me, the nukular, you better believe it.
Also, no way do NK have guidance systems that can target Guam, even if their missiles made it that far in the first place.
Usually when the North escalates rhetoric, it's really a round-about way of asking for aid/assistance from China for something. Talking shit back doesn't really do anything other than make it louder. Trump could easily just be trolling them for fun at this point as he obviously knows their actual capabilities.
Also, a quick strike at NK, taking out the leadership and key military stuff would just cause a massive humanitarian crisis that China and South Korea want to avoid at all costs.