Not so. He's not proposing it for VW, is he?
Trump's policies would artificially raise the price of cars produced outside of the U.S., in order to stifle competition with cars produced in the U.S., with the purpose of encouraging companies to open plants in the U.S. instead of overseas. That's protectionism 101.
No, that's not the policy he outlined.
I believe he has proposed it for any cars imported from Mexico, not just those made by U.S. companies.
And if he IS proposing that, then that's even worse. What do you think would happen if we imposed tariffs on U.S. companies that imported goods from overseas, but not on overseas companies that did the same thing? I suspect there would be many fewer U.S. companies around....