If the tariffs apply to both assembled cars and parts and raw materials used in assembling cars, then Trump's tariffs may turn out to be a worst case nightmare.
And Trump doesn't care if imported car prices go up because that will motivate American consumers to buy cars made here. But even if the final assembly is done here, the article implies that parts and materials made in other countries that are incorporated into the final assembly done in this country will still be subject to applicable tariffs.
So I guess the rising tide (tariffs) will lift all boats, but some more than others? Is Trump trying to run our ship of state onto the rocks?