By John Schofield ( April 3, 2025, 5:23 PM EDT) -- Prime Minister Mark Carney has vowed to fight U.S. tariffs on all fronts, including in the courts and with a new 25 per cent tariff on U.S.-made automobiles in direct response to a 25 per cent U.S. tariff on Canadian vehicles that went into effect at midnight on April 3....