US President Donald Trump meets with Canadian Prime Minister Mark Carney in the Oval Office of the White House in Washington, DC, on 7 October, 2025.
Photo: JIM WATSON / AFP

United States President Donald Trump has doubled down on ending trade talks with Canada over an anti-tariff advertising campaign, as Canadian Prime Minister Mark Carney sought to downplay the sudden rupture.

On his Truth Social network, Trump said he had "terminated" all talks and vented fury at what he called a "fake" ad that he said misquoted former president Ronald Reagan discussing tariff policy.

Trump said the campaign -- produced by the Canadian province of Ontario for US television -- was designed to "interfere with the decision of the US Supreme Court," which is due to rule on his sweeping global tariffs.

"CANADA CHEATED AND GOT CAUGHT!!!" he posted Friday. "Canada has long cheated on Tariffs, charging our farmers as much as 400%. Now they, and other countries, can't take advantage of the U.S. any longer."

Carney did not directly respond to Trump's move, instead only saying recent talks had made progress "and we stand ready to pick up on that progress and build on that progress when the Americans are ready."

Canada has "to focus on what we can control, and realise what we cannot control," he added.

Trump wrote that "the Ronald Reagan Foundation has just announced that Canada has fraudulently used an advertisement, which is FAKE, featuring Ronald Reagan speaking negatively about Tariffs."

He reiterated that in his Friday post, writing that Reagan "LOVED TARIFFS FOR OUR COUNTRY, AND ITS NATIONAL SECURITY."

The foundation wrote on X that the Ontario government had used "selective audio and video" from a radio address on trade that Reagan delivered in 1987.