Negotiations over the United States' newly announced tariffs on Canada have fallen apart, as Canadian Prime Minister Mark Carney says the countries won't "return to our old relationship".

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.