Trump's first-ever Section 338 tariffs are in force on roughly $20 billion in Canadian imports, and the new trade walls are already repricing the critical metals that power the American economy as Canada's dollar-for-dollar retaliation looms September 8.
President Trump's first-ever use of Section 338 of the Tariff Act of 1930 is now fully in force, and the fallout is rippling through the markets for the critical metals that power the American economy. The 50% tariffs on roughly $20 billion in Canadian imports took effect August 22 after last-minute talks collapsed, and analysts say the new trade walls are already repricing steel, aluminum, and the broader metals complex.
The action marks the first time in U.S. trade history that Section 338 has been deployed. It covers about 5% of everything Canada ships to the United States, spanning 554 tariff classifications across dairy, alcoholic beverages, and motor vehicles. The three presidential proclamations were signed July 20, and after a three-day pause and a week of signals that a deal was hours away, negotiations broke down and the duties went live at 12:01 a.m. Eastern on August 22.
Section 338 gives the president broad authority to impose duties on countries that discriminate against American commerce. Trump's team dusted it off to force fairer terms with America's second-largest trading partner, and the White House made clear the pressure is part of a wider push to rebalance North American trade in favor of U.S. workers and manufacturers.
U.S. Trade Representative Jamieson Greer said Canada "declined to finalize the trade deal under the terms agreed earlier this week," blaming "new demands and walk-backs of other commitments by Canada." Canadian Prime Minister Mark Carney answered that "last-minute changes in the U.S. proposed terms were unfair, uneconomic, and called into question the reliability of any deal" -- then suspended trade negotiations entirely.
Ottawa moved fast on retaliation. Carney announced Canada would match the U.S. tariffs dollar for dollar, and the full list published August 25 runs to 874 tariff items worth roughly C$27.6 billion, with rates of 15%, 25%, and 50% matched line for line against American duties. The counterpunch targets U.S. steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics, and takes effect September 8.
The Canadian Chamber of Commerce called the escalation "a body blow to North American competitiveness," a sign of how disruptive the fight has become for the world's most integrated supply chain. USMCA preference does not exempt covered goods, so even compliant Canadian shipments face the new 50% layer, with no in-transit exemption and no sunset date built into the statute.
The market response has been immediate. Metals and materials stocks surged early in the week as investors priced in the new tariff walls, with steel and aluminum leading the charge. But the longer-term picture is more complicated: critical metals feed everything from auto manufacturing to defense production, and higher input costs are a real risk for U.S. industry even as domestic producers gain a competitive edge.
The exclusions tell the story of a targeted campaign. Energy and potash sit outside the scope, as do goods already covered by Section 232 actions. That leaves the administration free to calibrate pressure on Canada while protecting American consumers from the sharpest spikes, a surgical approach that keeps the focus on manufacturing and trade fairness.
The September 8 deadline is the next flashpoint, when Canada's matching duties come due. For U.S. exporters, that means the same entry-timing math their Canadian counterparts are already wrestling with, and for manufacturers, it means watching whether critical metals prices keep climbing as the new tariffs settle in.
There is no sunset on Section 338 -- the action ends by revocation, by court order, or not at all. With U.S. midterms in November and 72% of Canadian goods exports flowing into one market, both sides face real pressure to find an off-ramp. Trump's team has signaled the tariffs are leverage, not an endpoint, and the ball is now in Ottawa's court to return to the table with terms that respect American workers.
Trump's first-ever Section 338 tariffs are in force on roughly $20 billion in Canadian imports, and the new trade walls are already repricing the critical metals that power the American economy as Canada's dollar-for-dollar retaliation looms September 8.
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