The collapse of Canada-U.S. trade negotiations has entered a sharper and more personal phase, with Washington now arguing that Ottawa deliberately abandoned an unusually favourable agreement. U.S. Trade Representative Jamieson Greer said Canada walked away from a “near-final” deal after weeks of negotiations and instead chose what he called “senseless retaliation.” The accusation came as the Trump administration unveiled another escalation in a dispute already affecting billions of dollars in cross-border commerce.
Ottawa tells a markedly different story. Prime Minister Mark Carney has acknowledged that Canada ended the negotiations, but says Washington introduced demands that were economically unacceptable and touched issues Canada considered non-negotiable. With Canadian counter-tariffs now in force and new U.S. import bans scheduled to begin later in September, the argument over who destroyed the deal is becoming almost as consequential as the tariffs themselves.
Greer Puts the Breakdown Squarely on Canada
Greer’s September 8 statement was unusually direct about where the Trump administration believes responsibility lies. The U.S. trade representative said weeks of intensive negotiations had produced a deal that was close to completion and would have given Canada better treatment than other U.S. trading partners. In Washington’s telling, Ottawa nevertheless chose to leave the negotiating table and retaliate. Greer characterized the subsequent American measures not as a new offensive but as a consequence of Canadian actions involving American alcohol, dairy products and motor vehicles.
That distinction is central to Washington’s public case. Rather than portraying the latest restrictions as another attempt to extract Canadian concessions, the administration is presenting them as enforcement against what it considers discriminatory Canadian policies. President Donald Trump’s government has repeatedly argued that trade relationships should operate on what it calls reciprocal terms. Greer said the administration intends to use the tools available to defend American workers and exporters. The language signals that Washington is trying to establish a simple narrative: a compromise was available, Canada rejected it, and the economic consequences now belong to Ottawa.
Ottawa Says the Deal Changed at the Eleventh Hour
Canada does not dispute that it ultimately suspended the negotiations. It strongly disputes Washington’s explanation for why. In an August 22 address, Carney said negotiators had made important progress and believed earlier that week that a mutually beneficial agreement was achievable. According to the prime minister, however, the United States subsequently presented new conditions that Canada considered economically damaging and inconsistent with the type of reliable long-term agreement Ottawa was seeking.
Carney also identified areas his government regarded as red lines. Canada would not accept terms that it believed compromised national sovereignty, weakened strategic industries or interfered with protections for French language and culture. His description turns Greer’s accusation on its head: Canada did walk away, but Ottawa says it did so because the proposed agreement ceased to be acceptable. More recently, Carney has maintained that Canada remains willing to negotiate a mutually beneficial arrangement. That matters because the dispute is not simply about whether negotiations failed. The deeper disagreement is over whether the final American proposal represented an exceptional deal, as Washington says, or an unreliable bargain requiring unacceptable concessions, as Ottawa maintains.
Canada Had Put Significant Concessions on the Table
The negotiations appear to have advanced considerably before collapsing. Carney said Canada was prepared to remove remaining retaliatory tariffs in strategic sectors such as steel, aluminum and automobiles if Washington substantially reduced corresponding U.S. tariffs to levels at which Canadian firms could economically continue exporting south of the border. Ottawa was therefore not insisting that every existing Canadian countermeasure remain untouched as a matter of principle.
Canada also offered movement on two politically sensitive American complaints. Carney said Ottawa would encourage provincial governments to put U.S. alcoholic beverages back on store shelves as part of a fair agreement. On dairy, Canada was willing to make administrative changes designed to address U.S. concerns while preserving the supply-management system, existing American quotas and applicable tariff structures. Those offers show why both governments can plausibly describe negotiations as having been close. But a near-final negotiation can still contain enormous unresolved issues. Automobile access, the durability of tariff commitments, cultural policy and Canada’s freedom to make independent economic decisions were not technical footnotes. For Ottawa, they went directly to the value and reliability of the proposed settlement.
Canada’s Counter-Tariffs Are Now More Than a Threat
Canada moved from negotiating pressure to implemented retaliation on September 8. The federal government imposed tariffs of 15%, 25% or 50% on selected American products, depending on the corresponding U.S. measure. Ottawa values the affected imports at C$27.6 billion and says the response is intended to match the American tariffs dollar for dollar. Washington describes approximately the same trade flow as about US$20 billion in U.S. exports, explaining the different headline numbers appearing on either side of the border.
The Canadian list reaches into industries with strong political and economic constituencies, including steel, dairy, appliances, agricultural equipment, pulp and paper, plastics and electronics. Ottawa has simultaneously introduced a C$7.5-billion package of new and expanded assistance for businesses and workers affected by the dispute, on top of earlier support measures. That combination illustrates the government’s strategy: raise the cost of U.S. trade actions while cushioning Canadian companies that may suffer from the resulting confrontation. It is also an acknowledgment that retaliation is not free. Tariffs can protect one domestic producer while increasing input costs for another, particularly when Canadian firms depend on specialized American equipment or components.
Washington Is Moving From Tariffs to Outright Import Bans
The American response takes the confrontation into more aggressive territory. On September 8, Trump signed five proclamations under Section 338 of the Tariff Act of 1930. The measures alter earlier tariffs and create outright import prohibitions on selected Canadian products. The White House says the bans will apply from September 29, while additions and removals from existing Section 338 tariff lists are scheduled to take effect on September 15.
Certain Canadian alcoholic beverages, dairy products and goods tied to the motor-vehicle dispute are among the targets. The administration is also reshuffling the products covered by earlier duties, removing items including rock salt and cement while adding others such as all-terrain vehicles and additional dairy goods. An import ban is considerably more disruptive than a tariff because paying a higher duty is no longer an option for affected shipments. Trump has also directed U.S. trade and procurement officials to remove Canadian-origin products from General Services Administration purchasing schedules that handle more than US$50 billion in federal procurement. Together, these measures extend the dispute beyond tariffs and into market access and government purchasing.
An Obscure 1930 Law Has Become a Major Trade Weapon
Section 338 gives the American president unusually broad authority when another country is found to discriminate against U.S. commerce. The statute permits additional duties of up to 50% and, if the alleged discrimination continues or increases, allows products from the country involved to be excluded from the United States. The provision has existed since the Tariff Act of 1930, yet it spent decades far from the centre of modern U.S. trade policy.
A Congressional Research Service assessment published before the current confrontation noted that the United States had never previously imposed tariffs under Section 338, although the statute had occasionally been discussed as negotiating leverage. Its sudden use against one of America’s closest trading partners therefore represents a significant policy development. The U.S. International Trade Commission is also examining its responsibilities under the provision and opened a public-comment process in September. For Canadian exporters, the legal history is not merely academic. Washington has demonstrated that Section 338 can be used not just to increase the price of Canadian goods but potentially to shut selected goods out of the American market entirely. That changes the risk calculation for industries accustomed to relatively predictable North American access.
The Auto Sector Shows Why Neither Side Wants to Give Ground
Automobiles are among the most economically sensitive pieces of the dispute because the Canadian industry is exceptionally dependent on the American market. Statistics Canada reported that more than 93% of Canadian motor-vehicle exports went to the United States in 2025. Canadian vehicle exports to the U.S. declined 9.6% that year, although auto-parts exports to the American market increased 2.3%. Those figures underline how difficult it would be for manufacturers to quickly replace lost U.S. customers.
The supply chain is also deeply integrated. A vehicle assembled in Canada can contain American components, while Canadian-made parts regularly cross the border for assembly in U.S. plants. That makes tariffs capable of producing costs on both sides of the border rather than simply transferring business from one country to another. Ottawa therefore sought significant reductions in U.S. automotive tariffs during the negotiations, while Washington has been pressing for changes it says would provide fairer treatment for American vehicles. For a factory community in Ontario or Michigan, this is not an abstract diplomatic quarrel. Production schedules, investment decisions and supplier contracts can all change when companies no longer know what a component or finished vehicle will cost to move across the border.
Alcohol and Dairy Have Become Symbols of a Much Bigger Fight
Alcohol and dairy account for a smaller portion of the overall bilateral economy than sectors such as energy or automobiles, yet both have become highly visible sources of friction. The Trump administration argues that Canadian treatment of American alcoholic beverages is discriminatory because several provincial authorities restricted or removed U.S. products while continuing to sell alcohol from other countries. Washington has similarly targeted Canadian dairy policies, particularly measures governing access for American cheese and other products.
Ottawa had shown some willingness to address both concerns as part of a broader agreement. Carney said the federal government would encourage provinces to return U.S. alcohol to shelves if a fair deal were reached. Canada also offered administrative adjustments relating to dairy while refusing to dismantle supply management or rewrite the fundamental tariff and quota structure protecting the sector. Those positions illustrate a recurring problem in trade negotiations: measures Washington describes as unfair barriers may be viewed in Canada as legitimate domestic policy choices. When such disputes become linked to sovereignty and national political identity, finding a compromise becomes harder because concessions can carry a political cost far beyond their direct economic value.
Canadians Could Feel the Cost of Retaliation Too
Carney has explicitly acknowledged that Canadian counter-tariffs can raise costs and reduce consumer choice. That admission matters because retaliation is sometimes discussed as though its economic burden falls entirely on the country being targeted. In practice, import tariffs are collected domestically, and part of the cost can be passed through to businesses and consumers purchasing the affected goods. Companies that rely on American machinery, electronics or industrial inputs may therefore have to find alternatives, absorb higher costs or seek tariff relief.
Canadian research provides a useful example of how that process can work. A 2026 Bank of Canada staff paper examining an earlier round of Canadian retaliatory tariffs found that retail prices of tariffed goods rose gradually, reaching about 6% after three months. The researchers estimated that this represented roughly one-quarter pass-through from a 25% tariff, rather than a full one-for-one increase. The findings do not predict the exact effect of the September measures, which cover a different mix of products, but they demonstrate why retaliation has domestic consequences. The government’s business-support programs and tariff-remission process are partly designed to manage those unavoidable trade-offs.
The Larger Question Is Whether Integration Can Survive the Loss of Trust
Despite the escalation, the economic incentive to find a workable arrangement remains enormous. Canada and the United States exchanged nearly C$3.5 billion in goods and services every day in 2025. Statistics Canada says 71.7% of Canadian merchandise exports still went to the United States that year, although that was down from 75.9% in 2024. At the same time, Canadian exports to non-U.S. destinations rose 17.2%, showing that some diversification is already occurring.
Ottawa has now made that diversification a long-term national policy, targeting a doubling of non-U.S. exports by 2035. Yet replacing the American market cannot happen quickly, especially in industries such as automobiles and steel whose production systems were built around North American integration. CUSMA also remains formally in force until 2036, preserving a substantial institutional framework beneath the political conflict. Carney has continued to say Canada is prepared to reach a deal that is mutually beneficial, stable and credible. The immediate obstacle is therefore not the absence of things to negotiate. It is trust: whether Ottawa believes Washington will respect the terms it signs, and whether Washington believes Canada is prepared to make the concessions it considers necessary. Greer’s accusation shows how wide that gap remains.
