“In recent days, the United States proposed new terms that were uneconomic, unfair, and undermined the net benefits for Canada," says PM Mark Carney.

Negotiations between the U.S. and Canada broke down late Friday and tariffs went into effect early Saturday morning.

Canadian Prime Minister Mark Carney vows to retaliate, says his country recognized that 'America has changed' and that the two countries would 'not return to our old relationship'