Let's face it, Donald Trump is a complete idiot when it comes to understanding trade.
Here is his latest threat:
Toyota Motor said will build a new plant in Baja, Mexico, to build Corolla cars for U.S. NO WAY! Build plant in U.S. or pay big border tax.— Donald J. Trump (@realDonaldTrump) January 5, 2017
Comparative advantage explains why Toyota would want to build cars in Baja, Mexico and it has nothing to do with "hurting" American workers.