https://phys.org/news/2018-06-tariffs-car-imports-double-edged-sword.html

But this decision—part of Trump's "America First" efforts to redress trade imbalances—may be counterproductive because not only do most of the targeted manufacturers have factories in the US, but American carmakers are among the largest importers of vehicles from Canada and Mexico.

The move would also come at a time when China—the world's largest car market—is moving in the opposite direction, lowering taxes on imported vehicles from 25 to 15 percent.