President Donald Trump's new tariff orders against Canada, Mexico and China all contain clauses suspending a duty-free exemption for low-value shipments below $800 that is widely seen as a loophole that has allowed shipments of fentanyl and its precursor chemicals into the United States.

The Trump administration is following through on its promise to impose 25% tariffs on goods imported from Mexico and Canada and raise tariffs on Chinese goods on Saturday.