U.S. tariffs on Canada have put experts at odds over how appropriate the action was, particularly given the unaddressed demand side of the fentanyl epidemic.

U.S. President Donald Trump's increased tariffs on steel and aluminum imports took effect on Wednesday as prior exemptions, duty free quotas and product exclusions expired, as his campaign to reorder global trade norms in favor of the U.

President Trump’s tariff policies sparked another day of political and financial-market turmoil Tuesday — along with new recognition that he really may be serious about trying to make Canada part of the United States.