So I was thinking about the way he worded this, 25% tariff until the border crossings stop. I think he might be onto a 4D chess move here.
If he tanks the US economy so badly that it's financially detrimental to cross the border then the flow of people across the border will definitely come down. If he tanks the economy hard enough we may even see the flow reverse, at which point he can lift the tariffs and declare the job done.
He is already happy to make Americans ignorant, illiterate, and spiteful to outsiders; is he really going to baulk at making them dirt poor as well?
This may come across as naïve, but I also wonder if the excision of all those "essential" layers of needless bureaucracy, might not free up some resources at a societal level to allow a more complete or holistic physical and mental health care system to emerge. After all we need to figure out something for the eye watering numbers of people who are employed directly or indirectly by the Insurance industries to do with their new found free time.
Hell, couple UHS with large scale tax reform and we might find that there are advantages at all levels of society to providing for people whatever their needs might be.
But then maybe I am a pathetic utopist who just needs to realise that Capitalism is simply the perfect structure for us all to live under.