President Donald Trump’s trade strategy has survived a major Supreme Court defeat because the administration is rapidly replacing one disputed tariff authority with several others.
In February, the Supreme Court ruled that the International Emergency Economic Powers Act, or IEEPA, did not authorize the president to impose tariffs. The six-justice majority concluded that Congress had not given the executive branch unlimited power to tax imports through a law designed primarily for national emergencies.
The ruling removed the legal foundation for some of Trump’s broadest tariffs. It did not, however, prevent him from using powers that Congress delegated through other trade laws.
That distinction is now shaping the next stage of the trade war.
TRENDING TODAY
Immediately after the ruling, Trump invoked Section 122 of the Trade Act of 1974 to impose a temporary 10% surcharge on many imports. That law permitted a surcharge lasting no more than 150 days without congressional approval. The measure ran from February 24 through July 24 and included several exemptions.
The administration then turned to Section 301, a better-established authority normally used to respond to specific foreign policies or practices considered discriminatory or damaging to American commerce.
The Office of the U.S. Trade Representative conducted investigations into 60 economies over what it described as inadequate restrictions on imports produced with forced labor. After hearings, consultations and more than 1,600 public comments, the administration imposed tariffs generally set at 10% or 12.5%, depending on the country and its policies.
Those tariffs may still face legal challenges. Companies and foreign governments could argue that the administration’s findings are too broad or insufficiently connected to measurable harm suffered by American businesses. No court has yet made such a determination.
The more consequential development may be Trump’s revival of Section 338 of the Tariff Act of 1930.
On July 20, Trump used the provision to announce additional 50% tariffs on selected Canadian products, including certain vehicles, dairy goods, alcoholic beverages, hockey sticks and cement. Energy, potash, products already covered by some national-security tariffs and several other categories were excluded. The new duties are scheduled to take effect on August 19.
The White House argues that Canada has treated American cars, alcohol and dairy products less favorably than comparable goods from other countries. Canadian measures cited by the administration include vehicle tariffs and quotas, restrictions on American alcohol and differences between access offered to U.S. and European cheese exporters.
Canada may dispute those claims or argue that some measures were legitimate responses to earlier U.S. tariffs. The legality of Trump’s action has not yet been tested in court.
Section 338 gives the president authority to impose duties of up to 50% after determining that a foreign country has discriminated against American commerce. If the alleged discrimination continues, the statute also permits the president to exclude selected products from the United States.
That language gives the White House substantial discretion. Unlike Section 301, the statute does not establish the same modern process of investigations, public hearings and consultations before tariffs are imposed.
Trade researchers say Section 338 was occasionally threatened as diplomatic leverage during the 1930s but have found no previous example of it actually being used to impose tariffs. Its revival therefore creates legal questions that courts have never fully answered.
Trump’s supporters argue that these powers are necessary because conventional negotiations have failed to stop discriminatory foreign practices. They say tariffs can protect domestic manufacturing, create leverage for better agreements and discourage companies from moving production overseas.
The danger is that a statute intended to answer identifiable discrimination could gradually become a general-purpose tariff weapon. If almost any foreign tax, regulation, quota or trade agreement can be described as disadvantaging the United States, the practical limits on presidential action may become difficult to identify.
The economic cost will not be confined to foreign exporters. American importers formally pay the duties, and previous tariffs imposed under Sections 232 and 301 were passed almost entirely into import prices. Federal Reserve research has also found that part of the more recent tariff burden gradually reached consumers through higher retail prices.
Domestic manufacturers may benefit when foreign competitors become more expensive. Other American companies may be harmed when they rely on imported materials, equipment or components. Trading partners can also retaliate against U.S. farms, factories and exporters.
The Supreme Court prevented Trump from treating emergency law as unlimited tariff authority. But Congress has left several older and broadly written trade laws on the books. Unless courts narrow those statutes or lawmakers amend them, the president may still possess enough legal tools to keep rebuilding the trade barriers that judges strike down.
Why It Matters
Tariffs can affect the prices Americans pay for vehicles, food, construction materials and manufactured goods. They can also protect some industries while increasing costs for businesses dependent on imported supplies.
The larger constitutional issue is whether tariff policy—historically a congressional power—can increasingly be controlled through unilateral presidential findings under laws written decades ago.
What Comes Next
The Canadian tariffs are scheduled to take effect on August 19 unless the administration changes course or reaches an agreement with Ottawa.
Affected businesses or governments may challenge the Section 301 and Section 338 measures in federal court. Those cases could determine whether the Supreme Court’s IEEPA decision represented a lasting restriction on presidential tariff power or merely forced the administration to choose different statutes.
Congress could also clarify or restrict the president’s authority, although lawmakers may be reluctant to surrender trade powers that benefit their preferred administration.
Trump invoked a rarely used provision of the 1930 Smoot-Hawley Tariff Act to impose new duties on Canadian imports, opening another potential legal battle over presidential tariff authority.
🔴 Trump deploys 1930s tariff law to bypass court limits on trade war
Trump invoked section 338 of the Smoot-Hawley Tariff Act of 1930 to impose a 50% tariff on Canadian imports, sidestepping a February Supreme Court ruling that blocked his use of the International Economic… pic.twitter.com/kiFnOfbb5D
— NewsTongue (@NewsTongueX) August 2, 2026
