The U.S. Trade Representative’s office says Canada is responsible for Washington escalating a trade dispute with its northern neighbour. In comments reported by multiple outlets, Jamieson Greer, described as the Trump trade czar, attributes the escalation to actions by Canada rather than to U.S. decisions.

The outlets largely repeat the same core claim: Greer points to Canada as the driver of increased tensions and frames the U.S. response as a reaction to Canadian conduct. They do not provide further details in the supplied excerpts about specific tariffs, sectors, or timelines, nor do they include a Canadian response. As presented across sources, the difference is mainly in wording and outlet framing rather than in substantive facts.

Overall, the reporting centers on Greer’s attribution of blame and the assertion that the U.S. escalates only after Canada’s actions, with limited additional context in the provided text.