Canada's retaliation tests the limit of American power under Trump

Two days before US-Canada trade talks dramatically derailed, Vice-President JD Vance was telling an audience at a private fundraiser that Prime Minister Mark Carney was a "very sweet guy". In a private audio recording leaked to the Canadian Press, Vance reportedly went on to say that Carney "comes in and puffs his chest out and says: 'I'm going to, like, out-tough Donald Trump.'" He described that approach as "hilarious" because the Canadians ultimately "climb down on a lot of issues". Maybe those comments, which received considerable coverage in Canada, were not the proximate cause for Carney's diplomats to pack up and go home over the weekend.

But they certainly didn't help. Carney's move abruptly terminated negotiations over a new trade agreement and sparked a fresh round of tariffs between neighbours who conduct more than $872bn (£640bn) in bilateral annual trade. The serious and deepening rift - and Vance's comments - offer the latest example of a Trump administration willing to exert force on the global stage against friend and foe alike, again highlighting the potentially disruptive consequences of such actions.

What's more, if Trump thought the Canadians would cave in the face of American pressure - as many US allies have done over the past 19 months - he may have miscalculated. And the consequences of that mistake could linger for the rest of his presidency. While the latest rupture is striking, friction between the US and Canada dates back to the first Trump administration and the negotiations that created the USMCA: the deal replacing the 1990s-era North American Free Trade Agreement (Nafta).

Complicating matters were personal clashes between Trump and Justin Trudeau, who was then Canada's prime minister. As Trump prepared to return to the White House in late 2024, he derisively referred to Trudeau as "governor" and to Canada as America's "51st State." Underlying those insults was a geopolitical outlook that positioned the US primarily as a hemispheric power entitled to exert political, military, and economic influence over its immediate region – and that most definitely included Canada. Administration officials viewed Canada as contributing too little to regional defence while disproportionately benefiting from trade with its southern neighbour.

In Trump's worldview, where economic security and national security are inextricably linked, Canada and Mexico - two of America's largest trading partners - became early, obvious targets. Canada announces 'dollar-for-dollar' retaliatory tariffs 'Half my business will be gone' - firms in Canada and US fear trade war How Canada could hit back to hurt the US economy - and Trump It's why the US president said he wanted to take over Greenland too. "If you listen to really anybody in state, treasury, or commerce [departments], you will hear the phrase 'economic security is national security'," said Drew Delong, head of corporate statecraft at the Kearney Foresight think tank.

By the start of this year, however, as North American trade negotiations proceeded in fits and starts, Trump's attention shifted away from Canada to his military interventions in Venezuela and then the Middle East. Across every region, though, the core line of Trump's international strategy remains consistent: the US is a dominant power capable of imposing its will for national benefit. Trump's second term has been a continuous test of those limits - and, at times, a lesson in finding exactly where they are.