The government of Canada has threatened to retaliate against U.S.-imposed tariffs on imports of softwood lumber, Canadian media reported Friday.

Axar.az reports citing to Anadolu Agency Prime Minister Justin Trudeau informed British Columbia (B.C.) Premier Christy Clark in a letter that he was considering her call for a ban on thermal coal exports, the Canadian Broadcasting Corporation reported.

Clark, whose province is big on softwood lumber and who is campaigning for reelection, was delighted with Trudeau’s letter that came after she suggested Canada hit back at the U.S. tariffs by charging duties on thermal coal.

About 94 percent of thermal coal is shipped from the U.S. through B.C. and bound for Asia where it is used in electrical generation. Trudeau also indicated that duties might be enacted against Oregon industries, the Canadian Press wire service reported.

Oregon is the home state of Democrat Sen. Ron Wyden, who has been an ardent supporter of the Canadian softwood tariffs. The U.S. last month accused the Canadian government of subsidizing the softwood lumber industry and imposed tariffs as high as 20 percent.

But the Canadian government disputes those charges and is investigating several Oregon industries that may be receiving U.S. subsidies, including the plywood, flooring, wood chips and wine sectors, CTV News reported.