The U.S. government said Wednesday that its final combined anti-dumping and countervailing duty rate for most Canadian producers will be 17.9 per cent.

Canada asked the World Trade Organization to examine the American use of punitive duties, alleging that they violate international law for five reasons.

Alberta producers and the province are vowing to fight for forestry workers after the Trump administration announced it will impose a tariff of about 20 per cent on Canadian softwood lumber imports.