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.

Chinese goods eligible for temporary duty exemptions will be subject to 10% US duties, according to a notice published in the Federal Register

The Canadian prime minister said the country has a $1.3 billion border plan and 10,000 "frontline personnel" protecting the border.