Scope: Federal
Branch: Executive
Severity: Green
Date occurred: June 1, 2026
The President signed a proclamation on June 1, 2026 further adjusting the tariff regimes applicable to imports of aluminum, steel, and copper into the United States. The proclamation was published in the Federal Register on June 4, 2026.
Constitutional basis: Executive adjusting import duties under Congress's Article I tariff power as delegated by trade statute, a delegation courts have repeatedly upheld.