CNN — On Saturday, President Donald Trump made good on his promise to impose steep tariffs on America’s three largest trading partners — Canada, China and Mexico — citing a national emergency on the flow of fentanyl and undocumented immigrants into the United States. The action, which is expected to take effect on Tuesday, includes a 25% duty on all imports from Mexico and most goods from Canada (there’s a 10% carve-out for energy-related items such as crude oil), and an additional 10% tariff on Chinese goods imported into the United States.