Canadian CEOs are being asked for feedback as Canada plans to levy a tranche of retaliatory tariffs against the United States if President-elect Donald Trump makes good on his threat to apply 25% tariffs against Ottawa.

Canadian officials are currently discussing what goods they will hike tariffs on in response to Trump’s threats, according to CNN, which cited people familiar with the matter. If both Trump and Canada hiked tariffs it would mark the start of a trade war that could be bruising for U.S. and Canadian businesses.