That’s a FAIL.
That tarrif will just be passed along to US consumers.
Tax these bits going the other ways please.
https://www.google.com/#q=money+transfer+to+mexico
What happens when an imported car or fan is made artificially expensive by adding a 30% tariff?
Answer: Because of pure greed manufactures will start to produce on this side of the border and pocket that money since the will charge the going rate. So greed is working for the US worker instead of against them.
But alas after a while, when all productions for fans and cars returns, they will have to compete with each other.