Trump has justified tariffs on goods from Canada, the top U.S. export market, by accusing it of failing to stop the cross-border flow of fentanyl, even though U.S. government data shows Canada accounts for only 1% of the fentanyl that enters the United States.

U.S. trade partners reacted Friday to President Donald Trump's executive order now set to introduce new tariffs on many of them starting Aug. 7 — as the global economy faces another test from the president's chaotic trade agenda.