Trump can reduce the size of the intelligence services dramatically and direct them to investigate what he wishes....(and NOT investigate broadly....but very narrowly according to his brilliant insights) you are wrong that they have control....they are not an independent entity like the Federal Reserve. 

Trump's intelligence will most likely reflect Trumps agenda (and NOT genuine threats to US...it is Trump the genius who already KNOWS ALL.... remember he's the only one who can FIX things)....it could well be that he has discovered World plots that we must go to war over, perhaps the Islam issues.