Trump said in a letter to Carney last week that the United States will put a 35 per cent tariff on Canadian goods starting Aug. 1.
The White House says that new tariff wouldn’t apply to goods that are compliant with the Canada-U.S.-Mexico Agreement on trade.
Canada has yet to respond formally to the latest threat, or to Trump’s recent moves to impose lofty tariffs on copper imports and double existing levies on steel and aluminum.
Carney and Trump agreed last month to work toward a new trade and security pact by July 21, but the U.S. president unilaterally pushed back the timeline to secure a deal.