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.

The US Court of International Trade found in May that Trump’s so-called “liberation day” tariff scheme was illegal. The court ordered the White House to unwind the levies but an appeal from the justice department secured a temporary halt to the mandate.