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A new front has opened in the battle over President Donald Trump’s trade agenda, and this time the challengers are coming from inside the United States. A coalition of 25 state governments has sued the administration over tariffs imposed on dozens of trading partners, including Canada, arguing that the White House used forced-labour concerns as a pretext for another sweeping expansion of presidential tariff power.
Canada has rejected the premise behind its inclusion, pointing to an import ban already in force and legislation intended to strengthen enforcement. The dispute now brings together three volatile issues: the fight against forced labour, the affordability consequences of tariffs and the unresolved question of how much power a president has to reshape trade without Congress.
A 25-State Challenge Lands in Trade Court
U.S. States Sue Trump Over New Tariff Canada Says Is Unjustified
The lawsuit was filed on August 3 in the U.S. Court of International Trade by a coalition led by Democratic state officials. The plaintiffs include California, New York, Illinois, Michigan, Minnesota, New Jersey, Oregon and Washington, along with more than a dozen other states. Their complaint names Trump, the Office of the U.S. Trade Representative and U.S. Customs and Border Protection among the defendants. It asks the court to invalidate the new tariff action, block its enforcement and order refunds for duties collected while the case proceeds.
State governments are not abstract participants in the tariff debate. They purchase vehicles, machinery, medical supplies, technology and construction materials while also overseeing economies filled with importers, manufacturers and retailers. When border costs rise, those expenses can appear in procurement contracts, infrastructure budgets and household prices. The states contend that the administration’s actions are harming their finances and residents while bypassing legal limits Congress placed on presidential trade authority.
What the New Tariffs Actually Cover
The disputed policy imposes tariffs of either 10 per cent or 12.5 per cent on imports from 60 foreign trading partners. Canada received the lower 10 per cent rate. Goods that qualify for preferential treatment under the Canada-United States-Mexico Agreement, known as CUSMA in Canada and USMCA in the United States, are exempt. That qualification matters because a significant share of cross-border trade already moves under the agreement, although importers must meet its origin and documentation requirements to receive preferential treatment.
The tariffs were introduced under Section 301 of the U.S. Trade Act of 1974. The administration says the targeted governments failed to adequately prohibit or enforce restrictions against goods made with forced labour. According to the states’ complaint, the measures collectively touch roughly 99 per cent of merchandise imported into the United States when the covered economies are measured together. Certain products and sectors remain exempt, creating a complicated system in which the applicable charge can depend on a product’s origin, classification, trade-agreement status and existing tariff treatment.
Why Canada Rejects the U.S. Premise
Ottawa says it shares Washington’s objective of removing forced labour from international supply chains but disputes the claim that Canada has failed to act. Canada prohibited the importation of goods produced wholly or partly with forced labour in 2020 as part of its CUSMA commitments. The federal Supply Chains Act, which took effect in 2024, also requires certain businesses and government institutions to report on efforts to prevent forced and child labour in their operations and supply chains.
The Canadian government has acknowledged that enforcement must improve. In June 2026, it introduced Bill C-35, which proposes a dedicated framework for identifying high-risk goods, demanding supply-chain tracing information and prohibiting imports when documentation is insufficient. Still, enforcement figures help explain American concerns. Canadian officials reported that the Canada Border Services Agency had intercepted or detained approximately 50 suspected shipments since 2021, including 33 in 2024. At the time of the briefing, one shipment had been conclusively determined to contain goods produced with forced labour and was prohibited from entering Canada.
The Legal Battle Over Section 301
Section 301 gives the U.S. trade representative authority to investigate foreign practices considered unreasonable, discriminatory or burdensome to American commerce. The Trump administration argues that it followed that process. USTR says it opened investigations involving 60 trading partners in March, received more than 1,600 public comments, heard testimony from over 100 witnesses and consulted with more than 45 foreign governments before issuing its determinations.
The states contend that the appearance of consultation does not prove the final action was lawful. They argue that investigating dozens of countries in less than three months was too rushed to support individualized findings of wrongdoing. Their complaint also alleges that the tariffs were insufficiently connected to particular forced-labour risks and therefore violated the Administrative Procedure Act. The legal question is not simply whether forced labour exists. It is whether the government established a reasonable factual connection between each country’s practices, the products being taxed and the remedy imposed.
Earlier Court Defeats Set the Stage
The case arrives after courts already limited two other parts of Trump’s tariff strategy. In February 2026, the U.S. Supreme Court ruled that the International Emergency Economic Powers Act did not authorize the president to impose the broad tariffs challenged in that case. The administration subsequently relied on Section 122 of the Trade Act for a temporary global tariff, but that measure also faced an adverse ruling in the Court of International Trade before expiring in July.
Section 301 may present a more difficult target for opponents because it is an established trade-enforcement law with a history of use by presidents from both parties. Earlier Section 301 actions generally focused on defined practices, products or industries, however, rather than nearly the entire import base of dozens of trading partners. The states argue that the administration has transformed a targeted enforcement mechanism into a replacement for the broad tariff powers courts previously rejected. The White House maintains that the new action is lawful, evidence-based and more durable than its earlier measures.
The Economic Stakes Extend Beyond the Border
Canada remains one of the United States’ largest commercial partners. U.S. Census Bureau data for June 2026 placed Canada second among American goods-trading partners, with approximately $30.7 billion in U.S. exports to Canada and $37.2 billion in imports. Combined trade reached roughly $67.9 billion for the month, representing close to 13 per cent of total U.S. goods trade. Even with CUSMA exemptions, a tariff affecting part of that commercial relationship can produce substantial costs.
Research has repeatedly challenged the idea that foreign countries alone pay American tariffs. Federal Reserve analysis of the 2025 tariff increases found that prices rose noticeably for exposed goods and that much of the added border cost was eventually passed through to the U.S. economy. International Monetary Fund researchers have also found strong tariff pass-through at the importer level, accompanied by lower import volumes and shifts toward cheaper suppliers or products. For families and businesses, those adjustments can mean higher prices, narrower choices or redesigned supply chains rather than an obvious charge labelled “tariff.”
Forced Labour Is Real, but the Remedy Is Disputed
The human-rights problem underlying the dispute is severe. Canadian government briefing materials cite an International Labour Organization estimate that roughly 28 million people worldwide are trapped in forced labour. Products connected to abusive working conditions can move through several countries and layers of suppliers before reaching North American consumers, making enforcement difficult. Governments may know where a finished product was assembled without having full visibility into the farms, mines, factories or subcontractors that supplied its components.
The states are not arguing that forced labour should be ignored. Instead, they say the administration’s remedy is too broad and inconsistently designed. Their legal filings cite specific concerns involving goods such as tobacco from Malawi, rice from Myanmar and beef from Brazil, while questioning why sweeping countrywide tariffs were chosen instead of measures directed at particular products, companies or supply chains. Exemptions for some categories further complicate the government’s argument that the tariff schedule is calibrated primarily around forced-labour exposure rather than broader economic or political objectives.
What Happens Next
The Court of International Trade must now decide whether the states have standing, whether USTR complied with Section 301 and whether the final action can survive review under federal administrative law. The plaintiffs are seeking an injunction, cancellation of the tariffs and repayment of duties already collected. Separate challenges from private businesses are also moving through the courts, increasing the possibility that judges will examine both the administration’s legal authority and the practical design of the tariff program.
Canada, meanwhile, has signalled that it will continue engaging with American officials while advancing its own forced-labour legislation. The exemption for CUSMA-compliant products limits the immediate impact, but it does not eliminate uncertainty for exporters that fail to qualify or cannot easily document origin. The final ruling could shape more than Canada-U.S. trade. It may determine whether Section 301 remains a targeted instrument for addressing specific foreign practices or becomes a pathway for presidents to impose far-reaching tariffs after other legal authorities have been restricted.
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