A very longstanding trade dispute, predating Trump by a mere 35 years....
Per wiki:
"The Canada–U.S. softwood lumber dispute is one of the largest and most enduring trade disputes between both nations.[1] This
conflict arose in 1982 and its effects are still seen today. British Columbia, the major Canadian exporter of softwood lumber to the United States, was most affected, reporting losses of 9,494 direct and indirect jobs between 2004 and 2009.[2]
The heart of the dispute is the claim that the
Canadian lumber industry is unfairly subsidized by federal and provincial governments, as most timber in Canada is owned by the provincial governments. The prices charged to harvest the timber (stumpage fee) are set administratively, rather than through the competitive marketplace, the norm in the United States.
In the United States, softwood lumber lots are privately owned, and the owners form an effective political lobby. The
United States claims that the Canadian arrangement constitutes an unfair subsidy, and is thus subject to U.S. trade remedy laws, where foreign trade benefiting from subsidies can be subject to a countervailing duty tariff, to offset the subsidy and bring the price of the commodity back up to market rates.
The Canadian government and lumber industry dispute this assertion, based on a number of factors, including that Canadian timber is provided to such a wide range of industries, and that lack of specificity makes it ineligible to be considered a subsidy under U.S. law. Under U.S. trade remedy law, a countervailable subsidy must be specific to a particular industry. This requirement precludes imposition of countervailing duties on government programs, such as roads, that are meant to benefit a broad array of interests. Since 1982, there have been four major iterations of the dispute."
https://en.wikipedia.org/wiki/Canada%E2%80%93United_States_softwood_lumber_dispute
