Trump has promised many things, all kinds of odd promises as if he had infinite power to do whatever he wants. That unrealistic attitude that excites the naive supporters (likely 99.99% of them) is what will lead to unforeseen consequences. It's too late now to do anything about this, it is just going to happen and unfold and have all sorts of complex ramifications, here's one:
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So anyone planning on buying a BMW after Trump does this, is going to be paying rather a lot more for it.