Carney said Saturday that Canada will impose retaliatory tariffs on U.S. goods starting Sept. 8.

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'

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

Canadian Prime Minister Mark Carney vowed to retaliate \