Doesn’t have to. Everyone paying attention knows that he rolled up ISIS pretty quickly.
One thing to bear in mind is that our peacetime ROEs are there to prevent minor skirmishes from starting a war. That is a decision that belongs soundly in the hands of national leadership - on those rare occasions like now when we actually have any.
Of course Mexico knows that they committed an act of war. Trump needs to scare them into fixing their problems. I ,am sure he has already communicated with el Presidente and this belated note is for public consumption.
I agree. But the puffery people here who think they know better what Trump should do than Trump himself are blabbing about Trump being talk and not action.