The greatest hope of those of us who know protectionism is folly has been that President Trump is taking a negotiating pose with his insistence that he's going to impose tariffs on steel and aluminum imports from every country in the world. That would be a pretty Trumpian thing to do, with the real objective being to get them to negotiate better overall trade deals.
Imposing steel tariffs on Canada is an especially disastrous idea, since they are our number one source of imported steel, with more than 10 times the steel coming from Canada as from the hated boogiemen in China. Is this really about nothing more than getting our continental neighbors to the table on a new and improved NAFTA?