Supreme Court to rule Feb 20 on legality of Trump’s 2018 global steel and aluminum tariffs

The U.S. Supreme Court will issue a landmark opinion on Feb 20 (with additional opinion days Feb 24–25) testing the legality and scope of the Trump administration’s 2018 global tariffs — 25% on steel and 10% on aluminum — imposed under Section 232 of the Trade Expansion Act of 1962. Central issues include whether Section 232’s national-security standard gives the president unlawfully broad authority (a non-delegation question) and what remedies follow if the tariffs are invalidated. Appellate courts split on the matter, prompting Supreme Court review. Litigation cited economic studies finding higher downstream manufacturing costs, net job effects that exceed positions protected, reduced imports, modest rises in domestic production, consumer and business cost increases, WTO challenges, and retaliatory duties. A ruling upholding the tariffs would affirm broad executive power to impose unilateral trade measures and could encourage future presidents to use Section 232 more freely. A ruling invalidating or narrowing Section 232 would constrain unilateral tariff use, likely push future administrations toward multilateral negotiation or congressional action, and could trigger legal and financial fallout such as tariff rebate claims affecting importers and the U.S. Treasury. Traders — including crypto traders — should monitor immediate market moves in the US dollar, commodities (steel, aluminum), and risk assets, and watch for second‑order effects on manufacturing input costs, supply chains, and trade tensions with major partners (EU, Asia) that can influence macro risk sentiment, FX flows, and commodity‑linked tokens. Primary keywords: Supreme Court, Section 232, Trump tariffs, steel and aluminum, trade policy.