The U.S. will impose an additional 10% tariff on Canada, President Trump said on Saturday, a punitive measure in response to an ad campaign that he said misrepresented comments by former President Ronald Reagan.

Donald Trump is stewing over an Ontario ad campaign that invoked former President Ronald Reagan to argue against his tariffs.

U.S. President Donald Trump said on Saturday he was increasing tariffs on Canada by an additional 10 percent “above what they’re paying now,” as he reacted again to an ad by Canada’s Ontario province, a day after it was aired during the World Series broadcast.

President Donald Trump said he's terminating trade negotiations with Canada citing a negative TV advertisement about tariffs.

An Ontario government ad that attracted the wrath of U.S. President Donald Trump was successful — even if it didn’t produce the outcome provincial officials might have anticipated, say experts in political communication.

General Motors Co. and Stellantis NV will be forced to pay tariffs on some US-made vehicles they import for sale in Canada, after the companies decided to reduce assembly-line work at factories in Ontario.