U.S. Conservative Policy Group Says Trump’s 50% Tariffs on Canada Violate Federal Law

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A major legal challenge in the United States is raising fresh questions about President Donald Trump’s authority to impose sweeping tariffs on Canadian goods. The dispute centres on additional 50% duties targeting selected Canadian imports, with American legal advocates arguing that the administration has exceeded the powers granted to it under federal trade law.

The Liberty Justice Center, a U.S. public-interest legal organization, filed a lawsuit challenging the tariffs on October 20, 2026. Constitutional law scholar Ilya Somin, affiliated with the libertarian Cato Institute, subsequently published an analysis supporting the argument that the measures are unlawful.

The controversy comes as Canadian businesses struggle with trade uncertainty, American importers face mounting costs, and both countries confront difficult questions about the future of their economic relationship. The courts must now determine whether the administration’s interpretation of a nearly century-old tariff law can withstand legal scrutiny.

An American Legal Challenge Takes Aim at Trump’s Tariffs

The opposition to Trump’s latest Canadian tariffs is not coming exclusively from Ottawa or American political opponents. On October 20, the Liberty Justice Center filed a lawsuit in the U.S. Court of International Trade on behalf of Gellert Global Group, a New Jersey-based food importer. The lawsuit argues that the administration improperly used Section 338 of the Tariff Act of 1930 to impose additional 50% duties on Canadian products. The legal organization maintains that Congress established limits on presidential tariff powers and that those restrictions cannot be bypassed simply by invoking an older statute. The case challenges the administration’s interpretation of federal law rather than disputing the president’s ability to pursue trade negotiations.

The challenge gained further attention when Ilya Somin, a professor at George Mason University and constitutional studies scholar at the Cato Institute, published a November 2 analysis arguing that the tariffs violate several legal restrictions. Somin contends that the measures represent an excessive expansion of presidential authority. His argument aligns with the Liberty Justice Center’s lawsuit, although the analysis is his own commentary, not a court finding. The development is significant because it demonstrates that objections to Trump’s trade policies extend beyond traditional partisan divisions. For affected businesses, the central question is whether these import taxes were authorized by Congress in the first place.

A Nearly Century-Old Law Is Behind the 50% Tariffs

The controversy revolves around Section 338 of the Tariff Act of 1930, part of the legislation commonly associated with the Smoot-Hawley tariffs enacted during the Great Depression. The provision allows an American president to impose additional duties of up to 50% when a foreign country discriminates against United States commerce under specified conditions. Although the law has existed for nearly a century, it had never previously been used by a president to impose tariffs. Trump’s administration revived the provision in July 2026 as part of its escalating trade dispute with Canada, making it the foundation for some of the most substantial new restrictions on Canadian exports.

The White House announced three tariff proclamations on July 20, targeting different categories of Canadian merchandise. Following a brief suspension, the additional duties took effect on August 22. Unlike several earlier tariff measures, the new restrictions also applied to covered products that otherwise qualified for preferential treatment under the Canada-United States-Mexico Agreement, known as CUSMA in Canada. However, the 50% rate does not apply to every Canadian export. The measures cover specified products and have been modified repeatedly. This distinction matters because the legal challenge concerns how the administration used Section 338, not a claim that all Canadian goods entering the United States face the same duty.

Washington Says Canada Is Discriminating Against American Exports

The Trump administration maintains that its tariffs are a legitimate response to Canadian policies that disadvantage American exporters. The White House has identified three principal areas of disagreement: motor vehicles, alcoholic beverages and dairy products. According to administration figures released in July, Canadian imports of American motor vehicles declined approximately 22% between April 2025 and March 2026 compared with the preceding 12-month period. American alcoholic beverage exports to Canada also experienced a substantial decline as provincial and territorial governments restricted purchases and sales of U.S. products. Washington additionally argues that Canadian dairy import quotas give certain European suppliers more favourable access than American producers receive.

Canadian officials strongly dispute the administration’s characterization of these measures. Prime Minister Mark Carney has argued that Canada’s auto-related countermeasures were introduced in response to earlier American tariffs, while provincial restrictions on U.S. alcohol similarly emerged from the escalating trade confrontation. Ottawa also maintains that its dairy quota administration complies with CUSMA. The historical record is complicated: a trade dispute panel ruled against certain Canadian dairy allocation practices in 2021, while another panel sided with Canada on additional American complaints in 2023. These competing interpretations illustrate why the dispute cannot be reduced to a simple disagreement about tariff rates. Both governments claim their actions are justified, but the legal question concerns whether the particular American response meets the requirements of U.S. federal law.

Legal Experts Question Whether Canada’s Actions Meet the Law’s Requirements

A central argument in the lawsuit is that Section 338 was designed to address genuine discrimination against American commerce, rather than every disagreement between trading partners. The distinction matters because Canada’s retaliatory measures were introduced after the United States imposed its own trade restrictions. Lawyers representing Gellert Global Group contend that responding to American tariffs does not automatically establish the type of discrimination required by the 1930 statute. They also question whether decisions by provincial liquor retailers to stop purchasing American products can justify sweeping federal import duties. The legal challenge asks whether the administration has demonstrated the specific discriminatory treatment necessary to activate the president’s authority.

The lawsuit raises another important question: whether the 50% tariffs are proportionate to the alleged economic harm. Section 338 authorizes additional duties intended to offset disadvantages imposed on American commerce, subject to a statutory ceiling of 50%. The challengers argue that imposing the maximum rate on a broad assortment of products goes beyond what is necessary to address Canada’s conduct. Canadian cheese, for example, became subject to tariffs under proclamations connected to automobile and alcohol disputes. The administration, however, maintains that Section 338 permits retaliatory action to protect American commercial interests. Ultimately, a court must decide how much discretion the statute gives the president in identifying discrimination, selecting products and determining appropriate rates.

Congress’s Later Trade Laws Could Undermine Trump’s Argument

Another major part of the challenge concerns legislation enacted decades after the original Tariff Act of 1930. In 1962 and 1974, Congress established additional frameworks governing American trade restrictions and presidential authority. Section 301 of the Trade Act of 1974, in particular, provides procedures for addressing unfair foreign trade practices. Those procedures generally involve government investigations, formal determinations and opportunities for public participation. The Liberty Justice Center argues that these more recent laws superseded or substantially limited Section 338. Under that interpretation, the administration cannot avoid modern safeguards by choosing a much older provision that offers fewer procedural requirements.

Whether that reasoning will succeed remains uncertain. Section 338 still appears in the United States Code, and its language expressly authorizes tariffs under certain circumstances. Congressional Research Service analysis has also recognized that the statute differs from newer trade provisions in its procedural requirements. Historically, federal courts have granted presidents considerable discretion when exercising tariff powers explicitly delegated by Congress. The legal issue is therefore more complicated than simply deciding which statute was enacted most recently. Judges must determine whether the laws can operate alongside one another or whether Congress intended newer legislation to replace the earlier approach. The outcome could establish important limits on how future administrations use older trade statutes to impose new economic restrictions.

A Seven-Day Tariff Deadline Creates Another Legal Problem

Even if the courts determine that Section 338 remains available to the president, the administration faces a separate challenge involving the timing of its tariffs. The statute generally requires 30 days between a presidential proclamation identifying affected goods and the collection of the corresponding duties. According to the Liberty Justice Center, the administration added several Canadian products, including cheeses imported by Gellert Global Group, to its tariff lists on September 8, 2026. However, those products became subject to the additional duties on September 15, only seven days later. The lawsuit argues that this shortened implementation period violated the statute’s procedural requirements.

This argument could become particularly important because it gives the court a more narrowly defined legal question to consider. Rather than deciding immediately whether the president can use Section 338 at all, judges could examine whether the administration followed the waiting period required for newly added products. Gellert is seeking refunds for duties it maintains were collected prematurely, alongside broader relief against the tariffs themselves. A finding that the administration implemented particular duties too quickly would not necessarily invalidate every tariff imposed under Section 338. Nevertheless, it could establish that the president’s discretion remains subject to enforceable procedural limits. For importers already paying substantial duties, even a ruling addressing a limited period could carry meaningful financial consequences.

The Supreme Court Has Already Rejected Another Trump Tariff Strategy

The latest challenge arrives after the Trump administration suffered a major defeat over presidential tariff authority earlier this year. On February 20, 2026, the U.S. Supreme Court ruled 6-3 that the International Emergency Economic Powers Act did not authorize the president to impose tariffs. That decision invalidated the legal foundation for sweeping duties Trump had introduced under emergency powers, including earlier measures affecting Canada, Mexico and China. The ruling reinforced an important constitutional principle: Congress controls the federal government’s power to impose tariffs, even though it can delegate specific authority to the president through legislation. The administration must demonstrate that its trade measures fall within the powers Congress actually granted.

The new lawsuit presents a different legal question because Section 338 expressly authorizes tariffs, whereas the emergency powers statute did not. Consequently, the Supreme Court’s February decision does not automatically determine whether the Canadian duties are unlawful. Nevertheless, legal scholars argue that the earlier ruling reinforces the importance of clearly defined statutory limits. The administration has also faced challenges involving other trade powers, including Section 122 of the Trade Act of 1974. A lower trade court ruled against that particular tariff strategy in May, with the decision subsequently appealed. Together, these cases demonstrate that the scope of presidential trade authority has become a recurring judicial issue. They also explain why the Section 338 lawsuit is attracting attention beyond the companies immediately affected.

An American Cheese Importer Shows How the Costs Spread

One of the most revealing aspects of the dispute is the business behind the lawsuit. Gellert Global Group is a third-generation American food company whose operations connect manufacturers, farmers, restaurants and grocery retailers across international borders. According to its legal representatives, one Canadian supplier purchases milk from dairy farmers in upstate New York, processes that milk into brie cheese in Canada and then sends the finished product back to American customers. A shipment arriving from Canada may therefore depend on American agricultural production from the beginning. The additional tariff increases the cost of the imported cheese, potentially affecting the Canadian processor, the American distributor and the dairy farmers supplying the original ingredients.

Gellert has estimated that the tariffs on its Canadian cheese imports could cost approximately US$40 million annually if maintained. That projected burden illustrates how quickly a 50% import duty can become a major operating expense. Under American customs procedures, the importer of record is generally responsible for paying duties when merchandise enters the country. Businesses must then decide whether to absorb those costs, negotiate new supplier arrangements or pass some of the expense to customers. Restaurants and retailers purchasing imported specialty foods may face higher wholesale prices, while suppliers risk losing orders if their products become less competitive. For businesses operating across the border, tariffs can therefore create financial pressure on both American and Canadian participants in the same supply chain.

Canada’s Exporters Face a Changing and Unpredictable Tariff System

The legal fight is unfolding against a constantly changing list of Canadian products subject to American trade restrictions. On October 23, the White House announced another round of adjustments, which took effect October 30. U.S. Customs and Border Protection subsequently confirmed that 22 tariff classifications were removed from one affected list while 100 additional classifications were added. Products affected by the changes include certain plastics, packaging materials, machinery, household products and industrial equipment. Earlier adjustments also introduced outright import bans on selected Canadian goods. Some products face additional Section 338 duties on top of tariffs imposed under separate trade laws, creating especially high costs for certain exporters.

The broader economic impact is significant, even though most Canada-U.S. merchandise trade remains tariff-free. In its October 2026 monetary policy projections, the Bank of Canada estimated that the average U.S. tariff rate on Canadian goods had increased from 5% in July to 7.5% in October. Approximately 80% of Canadian goods exports to the United States remained tariff-free. Meanwhile, Canada’s Parliamentary Budget Officer estimated that the combined trade measures introduced since early 2025 could reduce Canada’s real GDP by 1.4% after five years relative to a pre-tariff baseline. That projection reflects the wider trade conflict, not solely the contested Section 338 tariffs. Nevertheless, it demonstrates why prolonged uncertainty matters for Canadian manufacturers, workers and exporters planning future investments.

The Federal Court’s Decision Could Have Consequences Beyond Canada

The case remains before the U.S. Court of International Trade, where judges must consider whether the administration exceeded its statutory authority. Following an October 28 court conference, a three-judge panel established an expedited briefing schedule. Under that schedule, briefs supporting Gellert’s motion for summary judgment are due November 13, 2026, while the government’s response is due December 11. Gellert’s reply is scheduled for January 11, 2027, and the court has not yet set an oral argument date. The company is seeking a declaration that the tariffs are unlawful, an order preventing further collection and refunds with applicable interest. It also seeks to represent a broader group of affected importers.

Several outcomes remain possible. The court could find that the administration exceeded its authority, identify narrower procedural violations or ultimately uphold the tariffs under Section 338. The White House has indicated that it intends to defend the measures. Even a successful challenge would not automatically eliminate every American tariff affecting Canadian goods, since other duties operate under separate statutes. Nor would it resolve all outstanding disagreements over CUSMA, dairy access, manufacturing or cross-border retaliation. Nevertheless, the decision could establish an important precedent governing how much authority future American presidents possess to impose tariffs without additional congressional approval. For Canadian businesses, the immediate priority remains stability. For the American legal system, the larger issue is whether presidential trade powers can be exercised beyond the limits Congress established.

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