Donald Trump appears to have found a potent method to impose tariffs on imports from various countries, effectively punishing trade partners at will. This development follows a February Supreme Court ruling that struck down his previous tariffs based on the International Economic Emergency Powers Act (IEEPA), which the court rejected as an improper invocation of national emergencies.

Since then, Trump’s administration has sought alternative legal justifications. Recently, the U.S. imposed round-robin tariffs on multiple countries, citing unfair competition through imports made with forced labor. These tariffs were enacted under section 301 of the Trade Act of 1974, a statute previously used by Trump during his first term to penalize China for industrial subsidies. However, section 301 does not grant the broad authority Trump desires.

More concerning is Trump’s decision, made the Monday before the forced labor tariffs took effect, to impose a 50% tariff on imports from Canada under section 338. This section is seen as particularly dangerous because it provides the president with latitude to levy trade tariffs on any country based on vague arguments. The administration justified these tariffs by citing a "public health crisis" linked to illegal drugs from Canada, Mexico, and China; trade deficits harming American manufacturing; and political issues such as Brazil’s jailing of ex-president Jair Bolsonaro.

Trump’s own lawyers have argued before the Supreme Court that section 122 (related to IEEPA) should not be used as a substitute for other legal bases, highlighting the contentious nature of these tariff strategies.

The aggressive use of these statutes signals Trump’s determination to continue his trade war, despite legal and political challenges.

Sources

  • Guardian US, "Trump is determined to pursue his trade war – and he may be difficult to stop," August 2, 2026, by Eduardo Porter. Read more