Canadian Prime Minister Mark Carney says trade negotiations with the United States had turned “nasty” after President Donald Trump derided America’s neighbor and its leadership while threatening to expand tariffs.

Prime Minister Mark Carney said Canada’s tone toward the United States is already “quite firm” and insisted trade negotiations with Washington remain “constructive” as an Aug. 19…

Prime Minister Mark Carney says it's fair to describe Canada's approach to trade negotiations with the United States as "nasty," after President Donald Trump used that word to…