François-Philippe Champagne

The 15 to 50 percent duties on some 700 U.S. products started at 12:01 a.m., with U.S. steel, aluminum and iron, furniture, motorcycles and clothing in the 50 percent bracket and the 25 percent auto counter-tariff still in place. In a video address Carney said there is always a cost to action but it does not come close to the cost of standing still, and that the U.S. demands had shown Washington wanted Canada more dependent, not less.

Champagne set the counter-tariffs rate for rate against the U.S. Section 338 and 232 duties, covering C$27.6 billion of imports in steel, dairy, appliances, agricultural equipment, pulp and paper and electronics, and announced a C$7.5 billion package for affected workers and businesses on top of nearly C$25 billion provided since the tariffs began.

On June 27 Trump said he was terminating all trade discussions with Canada over the 3 percent digital services tax on U.S. tech companies, due for its first collection on June 30. On June 29 Finance Minister François-Philippe Champagne rescinded the tax, and the two leaders agreed to resume negotiations toward a deal by July 21, the deadline set at the G7 summit in Kananaskis.

Six days after the U.S. auto tariffs began, Canada's mirror measure came into force: 25 percent on fully assembled vehicles from the United States that do not meet USMCA rules, and 25 percent on the non-Canadian, non-Mexican content of vehicles that do, with a remission framework for automakers that kept production in Canada. Carney had announced the response on April 3, the day the U.S. tariff started.

The restored 25 percent Section 232 tariffs on steel and aluminum applied to Canada, the largest supplier of both. Ottawa answered dollar for dollar from March 13 with 25 percent tariffs on C$12.6 billion of steel, C$3 billion of aluminum and C$14.2 billion of other goods including tools, computers and sports equipment, on top of the C$30 billion already in force.