Prime Minister Justin Trudeau鈥檚 government is broadening its pushback against the latest U.S. decision to keep imposing duties on Canadian softwood lumber.

Trade Minister Mary Ng says Canada is launching challenges under the North American free-trade deal as well as before the U.S. Court of International Trade.

Nine days ago, Ottawa sought a judicial review of last month鈥檚 Commerce Department assessment of the levies, which provided modest relief but maintained the combined duty rate at 7.99 per cent.

Ng says Canada remains open to negotiating a resolution to the decades-old dispute, which she calls 鈥渦nfair, unjust and illegal,鈥� while arguing it increases housing costs.

She is again urging U.S. Trade Representative Katherine Tai to sit down and negotiate a resolution to the decades-old dispute.

Such a deal would be challenging since the U.S. takes issue with a long-standing regulatory system in Canada that it says puts American producers at a disadvantage.

Tai has said the U.S. would be willing to negotiate, but only if Canada does away with a system that allows provinces to set prices for timber from Crown land.

The U.S. ambassador to Canada echoed that sentiment in a statement issued Thursday evening.

鈥淭he United States is open to resolving our differences with Canada over softwood lumber to ensure a level playing field for U.S. industry,鈥� David Cohen said.

鈥淯.S. trade officials have communicated to Canada our commitment to reaching an agreement if Canada addresses underlying policy issues related to subsidization and fair competition.鈥�

Ng鈥檚 decision this week will have Canada bring the latest U.S. anti-dumping duty determination before the U.S. Court of International Trade.

Ottawa is also challenging the Commerce Department鈥檚 fourth review under Chapter 10 of the Canada-United States-Mexico Agreement, which pertains to review and dispute settlement procedures. Ottawa made the same move a year ago after the third review.

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