The way Trump has done things, any company that manufactures in the U.S. had better be able to get by with just the domestic U.S. market, because exports to Canada and Mexico aren't likely to be significant for quite some time, even if Trump backs off quickly. Lasting damage has already been done.
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[1]It remains to be seen if Mexico will eventually retaliate.
[2]Perhaps not favourably in terms of price/quality competitiveness, but certainly in a geopolitical "support your neighbour instead of China" sense.