DOJ Reportedly Pauses Canada Antitrust Cooperation as Tariff Fight Escalates

The U.S. Justice Department’s Antitrust Division has reportedly ordered staff to stop all cooperation with the Canadian government on joint cases and policy engagement. The reported instruction appears to be an internal operational pause, not a publicly announced withdrawal from the two countries’ longstanding antitrust-cooperation arrangements. Its scope, duration and rationale remain unclear. 63

What the reported directive says

The Wall Street Journal reported that the Antitrust Division received orders to halt collaboration with Canada after reviewing internal emails. According to the report, a Wednesday message titled “Pause on Canada” directed officials to cease joint work on cases and policy discussions with Canadian authorities. The message reportedly did not give a reason for the directive. 6

Subsequent reporting described the instruction as applying to cooperation on both enforcement matters and policy engagement, with the possibility that guidance could later change. 8

That reporting does not establish that DOJ has formally terminated any treaty, agreement or formal cooperation framework with Canada. Nor is there a publicly detailed DOJ explanation identifying exceptions, a sunset date, or an enforcement rationale for the pause. The distinction is significant: an internal work stoppage can be reversed without formally dismantling the underlying relationship. 36

Why the pause is being linked to the tariff dispute

The reported move arrived during a sharp escalation in the U.S.–Canada trade conflict. After bilateral trade negotiations collapsed around August 21–22, the United States imposed 50% tariffs on a defined group of Canadian goods. News reports described the affected imports at about $20 billion annually, while the Canadian government said the measures covered $27.6 billion of Canadian goods. 3720

Canada then announced matching counter-tariffs of 15%, 25% and 50% on U.S. products, effective September 8. Ottawa said its measures would apply to $27.6 billion in imports and match the corresponding U.S. tariff rates; Reuters reported that the list covered roughly 700 U.S. products. 2018

The timing makes the reported antitrust pause look like an extension of the wider confrontation into regulatory cooperation. But that is an inference, not a confirmed DOJ explanation: the reported email gave no reason, and no public DOJ statement in the provided material attributes the move to tariffs or trade negotiations. 6

What cross-border antitrust coordination normally involves

The Justice Department and Canada’s Competition Bureau have established cooperation mechanisms, including the Canada–U.S. Merger Working Group and its best practices for merger investigations. DOJ’s list of antitrust cooperation arrangements identifies the working group, while Canada’s Competition Bureau explains that staff typically seek a timetable for regular inter-agency consultations at the start of matters where substantial cooperation could be useful. 316

That coordination can be particularly valuable when a transaction or alleged anticompetitive conduct affects both countries. It can help regulators compare investigation schedules, discuss overlapping competition issues and consider remedies in markets that operate across the border.

A complete halt would not take away either authority’s ability to investigate or bring cases under its own laws. But it could mean that reviews run more independently, with fewer opportunities to align timing or exchange views. As a practical inference from the existing cooperation framework, that could lead to more duplication, slower coordination and a greater risk of divergent remedies in cross-border matters. 16

What remains unknown

Several key questions remain unanswered:

• Is the order temporary? The reporting characterizes it as a pause, but no public timeline has been provided. 68
• Does it cover every type of matter? The reported instruction refers broadly to cases and policy engagement, but public reporting has not set out operational exceptions. 6
• Will formal cooperation arrangements remain in place? No cited material indicates that DOJ has withdrawn from the established Canada-related cooperation frameworks. 3
• Will Canada respond publicly or alter its own engagement? The available reporting does not provide a formal Canadian Competition Bureau response to the directive.

The bigger implication

The immediate consequence is uncertainty for companies and advisers dealing with investigations or mergers that require attention on both sides of the border. The broader consequence is institutional: a trade dispute that began with tariffs is now reportedly touching a routine channel of competition-enforcement cooperation.

For now, the most defensible conclusion is narrow. The reported directive is a potentially broad internal pause in DOJ Antitrust Division cooperation with Canada, issued without a public rationale and without evidence of a formal termination of bilateral antitrust arrangements. Whether it becomes a short-lived negotiating tactic or a more durable break in enforcement coordination will depend on subsequent DOJ guidance and the direction of the U.S.–Canada trade dispute. 63