Boycott US

Time will tell. The ad campaign and Trump's reaction to it may play a role in the start of a shift on Republican unity in the States.

From https://www.cnn.com/2025/10/29/politics/canada-tariffs-senate-vote-trump where some Republican Senators voted with Democrats to end tariffs on Canada:

Sen. Tim Kaine, one of the Democratic co-sponsors of the Canada tariff resolution, said Tuesday that the president’s use of the International Emergency Economic Powers Act was not appropriate. The administration initially argued that fentanyl flowing from Canada into the US was the inciting emergency, and the tariffs were increased last week after the Ontario Premier ran an anti-tariff advertisement invoking quotes from former President Ronald Reagan.

“It is ridiculous to say that fentanyl is an emergency with respect to Canada, and it’s a pretext that’s just used being used to pour more and more tariffs onto Canada,” said Kaine. “And why don’t we pour gasoline on the fire? If they run an ad we don’t like, we’ll increase the tariffs by 10%.”