Incredible. Instead of putting tariffs on Chinese cheap stuff that most people can get by without, US is putting tariff on one of the main exports of its closest allies.
Well yeah, the US has been doing that forever. There is an economic incentive to fuck over Canada, and none to stop enjoying cheap labour and efficient supply chains from China. The US pretty much only does things when it is in it's interest, and if that happens to be a good thing it will be spun as a principled decision but that's generally a coincidence.