WASHINGTON (Reuters) - U.S. Commerce Secretary Wilbur Ross said on Saturday that threats of retaliatory trade actions from Canadian officials “are inappropriate” and will not influence final U.S. import duty determinations on Canadian softwood lumber.

U.S. Commerce Secretary Wilbur Ross speaks during the Milken Institute Global Conference in Beverly Hills, California, U.S., May 1, 2017. REUTERS/Mike Blake

“We continue to believe that a negotiated settlement is in the best interests of all parties and we are prepared to work toward that end,” Ross said in a statement issued by the Commerce Department.

On Friday, Canadian Prime Minster Justin Trudeau said his government would study whether to stop U.S. firms from shipping thermal coal from ports in the Pacific province of British Columbia in response to the lumber duties.

Canada also is considering duties on exports from Oregon such as wine, flooring and plywood, a source close to the matter told Reuters, citing the role played by U.S. Senator Ron Wyden, an Oregon Democrat, in pressing for the lumber tariffs.

Trade relations between the United States and second-largest trading partner Canada have soured since the Commerce Department in late April imposed preliminary anti-subsidy duties averaging 20 percent on Canadian softwood lumber imports.

The long-running dispute centers on U.S. lumber producers’ charges that lower-cost Canadian competitors benefit from an unfair government subsidy because Canadian timber is mostly grown on public lands.

Ross said in his statement on Saturday that the Commerce Department’s decision “was based on the facts presented, not on political considerations.”

“Threats of retaliatory action are inappropriate and will not influence any final determinations,” Ross added.

The Commerce Department still needs to finalize its anti-subsidy findings and the final duties must also be affirmed by the independent U.S. International Trade Commission before they can be locked in place for five years.

Ross said if any Canadian officials wish to present additional information in the case, the department “will consider it carefully and impartially.”