Mark Carney says "last-minute changes in the US proposed terms" made an agreement impossible

New American tariffs on Canadian goods took effect over the weekend after trade talks broke down at the last moment. Prime Minister Mark Carney suspended negotiations just before Friday’s deadline and said Canada would respond by matching US duties with levies of equal value. Negotiations had been underway since July, after President Donald Trump threatened 50 percent tariffs on roughly $20 billion in Canadian imports by August 19. Trump had paused those tariffs this week, saying the two sides were close. Carney acknowledged progress but said the United States abruptly altered its proposal, making an agreement impossible. US Trade Representative Jamieson Greer said Canada declined to finalize an agreement despite US concessions. Negotiators had reportedly discussed lowering duties on steel, aluminum, and autos. The collapse leaves Canada facing 50 percent US tariffs and tests one of the world’s closest trading relationships.