Justice Department orders antitrust division to pause all work with Canadian government

The U.S. Justice Department's antitrust division reportedly ordered a pause on all cooperation and policy engagement with Canadian authorities on September 2, 2026, amid escalating trade tensions. While the DOJ disputed the blanket freeze, the directive follows a series of trade disputes, including new 50% U.S. tariffs on $20 billion of Canadian goods, prompting Canada to plan retaliatory tariffs starting September 8, 2026. Tensions are further strained by President Trump's executive order renaming Lake Ontario to "Lake America."

DOJ antitrust cooperation pause

• ▪Section chiefs in the U.S. Justice Department's antitrust division were instructed on September 4, 2026, to provide lists outlining areas of cooperation with Canada by the end of the day
• ▪The U.S. Justice Department disputed reports of a blanket freeze, stating that the antitrust division was only asked to temporarily hold off on a scheduled meeting regarding a specific investigation
• ▪Lynda Marshall, the chief of the U.S. Justice Department's antitrust division's international section, ordered officials on September 2, 2026, to halt all cooperation on cases and engagement on policy issues with Canadian authorities

US-Canada trade war escalation

• ▪The trade war between the United States and Canada has resulted in tariffs on tens of billions of dollars in cross-border trade following Donald Trump's return to the White House in January 2025
• ▪The United States administration under President Donald Trump implemented new 50% tariffs on approximately $20 billion worth of Canadian goods in August 2026

Canadian retaliatory tariff response

• ▪Canadian Prime Minister Mark Carney stated that Canada will match Washington's new tariffs dollar for dollar to protect Canadian workers, farmers, families, and businesses
• ▪The Canadian government announced it would impose retaliatory tariffs on the United States beginning September 8, 2026, in response to the Trump administration's 50% tariffs on Canadian goods

Lake Ontario renaming controversy

• ▪President Donald Trump issued an executive order to rename Lake Ontario to "Lake America," adding to ongoing trade and diplomatic tensions between the United States and Canada
• ▪The executive order to rename Lake Ontario applies only to the United States federal government, while Canada, other international bodies, and United States states are not forced to follow the rebranding

Debatable claims

• ▪The United States should impose high tariffs on Canadian imports
• ▪The US should suspend antitrust cooperation with Canada over trade disputes
• ▪Canada should match U.S. tariffs with equivalent counter-tariffs

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