POLICY • NEWS • MARKETS

AG POLICY & MARKETS DAILY

SPECIAL REPORT  |  MONDAY, JULY 20, 2026  |  U.S./CANADA TRADE

Trump Reaches Back to Smoot-Hawley, Hitting Canada with 50% Tariffs

Never-before-used Section 338 powers target Canadian alcohol, autos and more in retaliation for provincial booze bans, auto duties and dairy quotas — while energy and potash escape, and USMCA still shields most U.S. sectors from the wider trade war

President Donald Trump on Monday ordered 50% tariffs on a broad swath of Canadian imports, reaching nearly a century back into U.S. trade law to punish what his administration calls “discriminatory” Canadian treatment of American alcohol, automobiles and dairy products. The move — executed through three proclamations signed under Section 338 of the Tariff Act of 1930, the Smoot-Hawley act — marks the first time any president has invoked that authority since Congress wrote it, and it threatens to reignite a trade war that had settled into an uneasy stalemate.

Link to White House fact sheet. Link to Proclamation on alcoholic beverages from Canada. Link to Proclamation on dairy. Link to Proclamation on motor vehicles.

The tariffs take effect after a 30-day waiting period required by the statute — around Aug. 19 — leaving a narrow window for Ottawa and Washington to negotiate. “Our staff have spoken with Canadian staff on this matter, so we expect to be able to talk as we try to resolve these issues,” a senior administration official told reporters on a July 20 press call.

Sources: White House fact sheet; senior administration officials, July 20, 2026.

 THE THREE GRIEVANCES

Each proclamation answers a specific Canadian measure.

First, provincial liquor monopolies: all but two provinces — Alberta and Saskatchewan — have kept U.S. alcohol off their shelves since March 2025, a boycott the White House says has cut U.S. alcoholic beverage exports to Canada by 81%.

Second, autos: Canada’s retaliatory tariffs apply to U.S.-built vehicles but not to those from other countries, which the administration links to a 22% drop in U.S. motor vehicle shipments north.

Third, dairy: Ottawa’s tariff-rate quotas on U.S. cheese are more restrictive than the terms Canada gives the European Union, the latest chapter in a dairy-access fight that predates USMCA itself.

 A LEGAL GAMBLE ON A 96-YEAR-OLD STATUTE

The choice of Section 338 is itself the story. The Supreme Court in February struck down Trump’s sweeping IEEPA tariffs — including the 35% duty on non-USMCA Canadian goods — forcing the administration to rebuild its tariff wall from older, narrower authorities. Section 338 allows duties of up to 50% against countries that discriminate against U.S. commerce relative to third countries, and it has sat unused since 1930.

Litigation is close to certain. During the IEEPA fight, the Trump-aligned America First Policy Institute argued the 1930 law fit emergency tariffs “like a glove,” while a coalition of former federal officials countered that Section 338 “has been superseded” — first by the Trade Expansion Act of 1962, then by Section 301 of the Trade Act of 1974 — and is no longer operative at all. Trade-law analysts at the Peterson Institute have warned that stretching Section 338 too broadly “would be seen as invoking a substitute authority similar to the one that the Supreme Court just found to be illegitimate.” The administration’s tailored, Canada-specific approach appears designed to survive that scrutiny — but no court has ever construed the provision.

Sources: Blakes U.S.-Canada tariff timeline; White House; court records; press reports.

 THE USMCA SHIELD: WHY MOST U.S. SECTORS ARE STILL PROTECTED

Largely lost in the escalation is how much of the relationship the USMCA still insulates — on both sides of the border. Since March 2025, goods that qualify under the agreement’s rules of origin have been exempt from the broadest U.S. tariffs on Canada, and since last September, Prime Minister Mark Carney has matched that exemption in reverse, lifting Canada’s counter-tariffs on USMCA-compliant American goods. “We have re-established free trade for the vast majority of our goods,” Carney said at the time, noting more than 85% of two-way trade crosses the border tariff-free.

That shield matters enormously for U.S. agriculture. American farm exports to Canada — $68.7 billion in 2024, the largest single market for U.S. agriculture — currently face essentially no Canadian tariffs so long as they are USMCA-compliant, even as steel, aluminum and autos absorb duties in both directions. U.S. energy producers enjoy similar protection: the 75%-plus of Canadian refined-product and natural gas imports that come from the U.S. flow duty-free. And the new Section 338 action conspicuously spares the inputs U.S. farmers and refiners depend on — energy, potash and critical minerals are all carved out.

 CANADA’S REACTION: ‘MORE THAN IRRITANTS’

Ottawa had issued no formal retaliation as of Monday evening, and officials confirmed staff-level talks are under way. But the announcement lands on raw nerves. Just three days earlier, Trump threatened separate tariffs to charge Canada for wildfire smoke drifting south — an “invasion of filthy, polluted air” he blamed on “willful negligence” — a threat Manitoba Premier Wab Kinew called “unacceptable” while his province battled evacuations. An administration official stressed Monday’s action is unrelated to the wildfire dispute — but confirmed Trump “has been given options” for separate wildfire tariffs, meaning a second Canada-directed action could still be coming.

Carney has spent months refusing to trade away the provincial liquor bans cheaply, framing them as bargaining chips against what he calls the real barriers: “You know what’s an irritant… 50 per cent tariff on steel. 50 per cent tariff on aluminum,” he said this spring, insisting U.S. alcohol returns to Canadian shelves only when Washington relents on steel, aluminum and lumber. Ontario Premier Doug Ford has vowed not to restock American liquor under pressure, and Conservative leader Pierre Poilievre — who branded Carney’s September tariff climbdown a capitulation — will push the prime minister toward a harder line. Canada’s remaining counter-tariffs on U.S. steel, aluminum and autos give it ready-made escalation options, as do the provincial monopolies the White House is targeting.

Status as of July 20, 2026. Sources: Blakes timeline; CBC; administration officials.

 WHAT IT MEANS FOR U.S. AGRICULTURE

The risk is retaliation and spillover. If Ottawa answers in kind, the $68.7 billion U.S. farm-export pipeline to Canada is the obvious target — led by fuel ethanol ($1.4 billion), pet food ($1.3 billion), chocolate, beef and pork. Canada’s 2025 counter-tariff lists leaned heavily on U.S. food and agricultural products, from orange juice to whiskey, and provincial liquor bans have already shown how quickly U.S. wine, beer and spirits can lose shelf access. Meanwhile, escalating the dairy fight through Smoot-Hawley rather than USMCA’s dispute process — where the U.S. lost two prior dairy TRQ panels — hardens Canadian resistance on the one ag-access issue U.S. dairy most wants solved.

Figure 1. Two-way U.S.-Canada agricultural trade reached about $120 billion in 2024 — Canada is the No. 1 buyer of U.S. farm goods. Chart: USDA ERS data.

 ENERGY: EXEMPT, BUT EXPOSED TO THE NEXT ROUND

The energy carve-out preserves the continent’s deepest commercial artery. Canada shipped 3.9 million barrels of crude per day to the U.S. in 2025 — 63.4% of all U.S. crude imports — feeding Midwest and Rocky Mountain refineries built to run Canadian heavy barrels, plus essentially 100% of imported natural gas and 81% of imported electricity. Tariffing those flows would raise Midwest pump prices almost immediately, which is precisely why every U.S. tariff action since February 2025 has treated energy gingerly. The exposure runs the other way: Ontario briefly slapped a surcharge on electricity exports to Michigan, New York and Minnesota in March 2025, and premiers have repeatedly floated energy leverage if the trade war deepens. A wildfire-tariff sequel aimed at Canada could invite exactly that.

Figure 2. The new tariffs carve out the imports the U.S. can least replace: Canadian crude, natural gas, electricity and potash. Chart: Canada Energy Regulator (2025); potash share approximate, USGS/Library of Parliament.

 FOOD AND BEVERAGE: CHECK THE PRICE TAGS IN 30 DAYS

If the tariffs take effect as written, American consumers will feel them first at the liquor store and the grocery aisle. Canadian whisky, ice wine and other spirits face the full 50% duty — a pointed echo of the provincial bans that triggered them. Depending on the final product lists, staples in the $52 billion flow of Canadian food imports could follow: canola oil ($4.2 billion, the top U.S. food import from Canada), baked goods ($3.1 billion), beef and frozen potatoes. Fish is exempt, sparing one grocery category. Food makers on both sides of the border, which have spent 18 months rerouting supply chains around each tariff round, now face another 30 days of list-reading — and a fall in which the USMCA review, the wildfire-tariff threat and possible Canadian retaliation all remain live.

 WHAT TO WATCH