Canadian businesses and industry leaders are bracing for the full effects of fresh 50 per cent U.S. tariffs, crossing their fingers that domestic support will come quickly, after trade talks between the two countries fell apart.

Businesses have warned that Trump's new 50% duties could cripple U.S. their sales if they take effect.

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'