Canada has cracked down on fentanyl crossing the border in a bid to prevent President Trump's tariffs from hitting trade with the U.S.

Trump initially claimed his 25-per-cent tariff threat was in response to what he called the failure by Canada and Mexico to curb the illegal flow of people and drugs across the border. His complaints have since expanded far beyond border security. On Thursday, Trump repeated his objections to trade deficits with both countries.