A dispute over the fate of Canadian-built heavy trucks has blown apart a prospective US-Canada trade deal, turning a narrow automotive carveout into a broader fight over sovereignty, supply chains and economic power.

Two days before the breakdown, officials had sounded close to a compromise. The outline would have reduced US auto tariffs to 15% from 25%, alongside relief on steel, aluminum and lumber. But Canada insisted that medium- and heavy-duty vehicles—including Ford F-350 pickups made in Ontario—receive the same treatment. Washington viewed that as a late additional demand; Canadian industry said the US had instead removed those vehicles from the relief package at the last minute.¹

By late Friday, the talks had collapsed. Prime Minister Mark Carney said excluding trucks was “a big change” and that Ontario’s Ford plant would have been left out “with no rationale.” Flavio Volpe of the Automotive Parts Manufacturers’ Association argued the move looked like an attempt to “get rid of auto manufacturing in Canada.”¹

The dispute quickly widened. The US imposed 50% tariffs on about $20 billion in Canadian goods, while Ottawa set Sept. 8 for dollar-for-dollar counter-tariffs and targeted protection for exposed sectors. Carney said Canada had offered to remove remaining retaliatory tariffs if Washington substantially lowered its own duties, but concluded that US demands had crossed a line: “They asked too much and offered too little.”²

Washington casts the escalation differently. US Trade Representative Jamieson Greer said the administration had offered cuts on sensitive products and was now pursuing measures that “respond to Canadian retaliation,” framing the decision as protection for American workers and supply chains.² Canadian union leader Lana Payne, meanwhile, warned that a narrow deal favoring US parts could leave Canada’s auto sector weaker when the wider North American pact comes up for review.¹

The rhetoric has hardened alongside the tariffs. Carney accused the US of using “economic integration as a weapon,” saying Canada had been attacked; on X, Yann LeCun amplified a post alleging that tariff reversal was being tied to changes affecting Canada’s French language, Quebec culture and national identity.²Yann LeCun (ylecun)³ With no further talks planned, a truck classification has become the flashpoint for a far larger rupture.