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.

After Canada failed to strike a trade deal with Washington, the president raised tariffs on some Canadian exports this week.

In Donald Trump’s first term as president, Japan stood out as an exception in opting not to retaliate against his tariff hikes, as the late Prime Minister Shinzo Abe reckoned it was better to shrug them off in favor of maintaining the broader economic and security relationship.