Trump last month delayed the implementation of the 25% tariff against goods from neighboring countries when Canadian Prime Minister Justin Trudeau and Mexican President Claudia Sheinbaum rushed to reassure him they would crack down on illegal immigration and fentanyl smuggling.

Trump's 25% tariffs on Mexico and Canada start March 4, as he doubled China's tariff to 20% and added agricultural tariffs. Read more for tariff implications.

Starting just past midnight, imports from Canada and Mexico are now to be taxed at 25 percent, with Canadian energy products getting tariffed at 10 percent.