Assuming he believes his words (as opposed to using rhetoric to get what he or someone around him wants, in either case unfortunately, I think he’s serious). I think he sees anything purchased from another country as “subsidizing” that country. To him, its money the US had that Canada now has. I sometimes think he somehow thinks the US should be given things, because…??? Every transaction has to have a “winner” and a “looser” and whoever has a + on the balance sheet is the winner, it doesn’t matter what that + really means. (I can only bend my logic so far to try to figure these things out)