U.S. Trade Chief Tells Canada: Drop Retaliation or Face Trump’s New 50% Tariffs

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The Canada-U.S. trade fight is entering another deadline-driven weekend with billions of dollars in cross-border commerce hanging in the balance. U.S. Trade Representative Jamieson Greer said Friday that Canada must resolve retaliatory measures if it wants to avoid a new round of 50% U.S. duties scheduled to begin August 19. The warning sharpens Washington’s pressure on Ottawa just as Canadian trade minister Dominic LeBlanc and chief negotiator Janice Charette remain in Washington for intensive talks.

The threatened duties would reach nearly US$20 billion in Canadian goods and, unusually, would apply even to covered products that qualify for preferential treatment under CUSMA. Canada is seeking relief from existing U.S. sectoral tariffs while resisting a settlement that would amount to a one-sided rollback of its own countermeasures.

Greer Draws a Line Days Before the Deadline

Greer’s message on Friday was unusually direct. Speaking in Des Moines, Iowa, the U.S. trade representative said the incoming duties were a response to Canadian retaliatory measures and that those issues would have to be resolved. He still described discussions with Canadian officials as constructive, but made clear that President Donald Trump’s trade program would take priority. That leaves Ottawa with only days to decide what concessions, if any, can unlock a deal or delay the tariffs entirely.

The deadline is August 19, when three presidential proclamations are scheduled to activate additional 50% duties on selected Canadian imports. LeBlanc and Charette have intensified their Washington schedule, with LeBlanc meeting Greer four times in three weeks. Canadian officials were briefing provinces and an advisory committee from Washington on Friday. Yet people familiar with the talks said the two sides remained far apart, making the weekend negotiations more than routine diplomacy.

The Tariffs Target a Smaller but Vulnerable Slice of Trade

The new tariff package is large enough to hurt specific industries without covering most Canada-U.S. commerce. USTR says it would affect nearly US$20 billion in Canadian imports, roughly 5.2% of the US$383 billion in goods the United States imported from Canada in 2025. Covered products extend beyond the sectors that triggered the dispute, including wine, cement, dairy products, clothing and hockey sticks.

The bigger change is how the duties interact with CUSMA. Many earlier U.S. tariffs left qualifying North American goods exempt, preserving a duty-free channel for integrated supply chains. These Section 338 duties are designed to apply to covered goods even when they meet CUSMA origin rules. Energy, potash, products already subject to Section 232 tariffs, fish and some critical minerals are excluded. For exporters inside the list, however, an additional 50% duty can abruptly reshape prices, contracts and customer demand almost overnight financially.

Canada Has Already Narrowed Its Retaliation

Canada’s retaliation is narrower than it was at the start of the trade war. Ottawa removed most counter-tariffs placed on U.S. goods in 2025, effective September 1 that year, after Washington preserved tariff-free treatment for many CUSMA-compliant Canadian products. But federal counter-tariffs on U.S. steel, aluminum and automobiles remain, reflecting Canada’s argument that those sectors still face American trade barriers.

That distinction matters because Washington portrays Canada as an active retaliator even after Ottawa narrowed its measures. Canada’s automotive response includes a 25% tariff on non-CUSMA-compliant U.S. light vehicles and a 25% tariff on the non-Canadian and non-Mexican content of qualifying U.S.-assembled light vehicles. Ottawa says those measures protect Canadian production while U.S. auto tariffs remain. Greer’s demand therefore reaches directly into policies Canada has tied to reciprocal relief, not merely symbolic tariffs that can be removed without negotiation or political cost at home.

Autos, Alcohol and Dairy Are at the Heart of the Fight

Autos, alcohol and dairy sit at the centre of Washington’s case. The Trump administration argues that Canada treats U.S. vehicle exports less favourably through tariffs and import quotas, while provincial restrictions on American alcohol have reduced U.S. access to Canadian shelves. A White House proclamation said U.S. alcohol exports to Canada fell sharply after provincial measures began in March 2025.

Dairy is more complicated because the dispute is not simply about a retaliatory tariff. Canada operates a supply-management system with tariff-rate quotas that allow specified quantities of imports at preferential rates while protecting the domestic market outside those limits. U.S. officials have long argued that Canada’s quota administration restricts practical market access. Ottawa views supply management as a core domestic policy. That makes dairy difficult to trade away quickly, especially while Canadian negotiators are seeking concrete U.S. concessions on steel, aluminum and other sectoral tariffs.

Trump Is Using an Unusual 1930 Trade Law

Trump’s legal tool also raises the stakes. The administration invoked Section 338 of the Tariff Act of 1930, an obscure provision allowing a president to impose duties of up to 50% when another country is judged to discriminate against U.S. commerce. The July 20 proclamations were written to take effect 30 days later, at 12:01 a.m. Eastern time on August 19.

Section 338 gives the White House flexibility. The proclamation states that the president may suspend, revoke, supplement or amend an action when the public interest requires it. That means the deadline is real but not irreversible. It also turns the tariff threat into negotiating leverage: Washington can demand movement on Canadian policies while retaining the ability to delay or reshape the duties. For businesses, legal flexibility does not equal predictability. Purchase orders, customs classifications and pricing decisions still must be made before political bargaining is finished.

Ottawa Wants Existing U.S. Tariffs Addressed Too

Ottawa’s objective is broader than preventing one new tariff package. Global Affairs Canada said Friday that LeBlanc and Charette were focused on addressing existing U.S. sectoral tariffs while avoiding the Section 338 duties. That sequencing matters. Canada has resisted surrendering countermeasures while U.S. restrictions on Canadian steel, aluminum, autos and other products remain, because doing so could weaken leverage without securing durable relief.

Recent talks have produced mixed signals. A Canadian government source said Thursday that Washington also wanted an agreement before August 19, suggesting both governments value avoiding escalation. By Friday, however, Reuters reported that Canada and the United States remained far apart on a draft arrangement. LeBlanc and Charette planned to stay in Washington through the weekend. The emerging possibility is an interim deal rather than a comprehensive settlement, but even that would require enough movement to satisfy Trump before the tariffs are scheduled to begin.

Canadian Businesses Are Learning to Live With Tariff Deadlines

The uncertainty is already changing business behaviour. Canadian Press reporting found that some exporters are no longer rushing shipments across the border before every tariff deadline. Janine Harker, president of the Canadian Society of Customs Brokers, described companies as being in a posture of “watchful waiting,” with many assessing exposure rather than front-loading goods. Months of shifting deadlines and exemptions have made timing the border increasingly difficult.

The broader economy has already absorbed damage from the trade conflict. Global Affairs Canada reported that total merchandise trade with the United States fell 4.8% in 2025, while Canadian exports to the U.S. dropped 5.3%. The Bank of Canada has said industries facing sectoral tariffs represent about 15% of Canadian exports and have seen declines in aluminum, steel, lumber and vehicles. Another targeted tariff wave would therefore hit an economy adapting to weaker and less predictable U.S. market access.

The Weekend Could Determine Whether the 50% Duties Arrive

The next few days leave several outcomes. Trump could allow the 50% duties to take effect as written, suspend them while talks continue, narrow product coverage, or use a Canadian commitment to unwind specified countermeasures as the basis for an interim accord. The proclamations give the president room to alter the measures, but Greer’s Friday comments show Washington expects concrete movement rather than assurances alone.

For Canada, the challenge is deciding how much retaliation to surrender without receiving too little in return. Removing some measures could protect exporters immediately, yet a one-sided concession could leave existing U.S. tariffs untouched and reduce Ottawa’s leverage in later negotiations. Holding firm carries the opposite risk: Canadian producers on the Section 338 list could face an additional 50% border cost within days. With LeBlanc and Charette in Washington through the weekend, the question is whether talks can produce terms both capitals can defend.

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