President-elect Trump’s pledge to impose tariffs on Mexico and Canada threatens to upend decades of North American integration, a bumpy process that’s recast the two U.S. neighbors as providers of raw and finished goods for the world’s biggest economy.

Canada’s premiers are urging Prime Minister Justin Trudeau to step up border security and defense spending to assuage US President-elect Donald Trump’s concerns, with the leader of the largest province calling the federal government “slow to react” and “stuck on its back foot.

Canadian Prime Minister Justin Trudeau says he spoke with President-elect Trump Monday evening about his tariff pledge and vowed to address concerns the incoming administration might have about its northern neighbor.

Canada was scrambling Tuesday to blunt the impact of US President-elect Donald Trump's threat to implement steep tariffs once he takes office, as experts warned of a potentially "catastrophic" hit