While it's certainly true that enacting protectionist measures against Americans hurts their own economies, the same is true of our own protectionist policies. The basic economic reality is that trade materially benefits both parties, so when the government intervenes and attempts to restrict trade, both sides are harmed as a result. The fact that trade is happening across national boundaries as opposed to state or local boundaries does not change the economic reality at the heart of trade, which is why no politician, Trump included, should try to "fix" the situation. The last thing Americans need is for the political system to manage trade between free people.