Prime Minister Justin Trudeau and the premiers of Canada’s provinces are in high-stakes talks over how far to go in using oil and other commodities as a weapon if the US starts a regional trade war.

President-elect Donald Trump's threat of tariffs against Canada has resulted in a push in the country from the worlds of academia to politics to preserve, not punish, trade with the U.S.

The country’s leaders are trying to persuade the new administration to hold off while also seeking ways to inflict pain in a tariff spat.