A Canadian official Monday brutally trolled President Donald Trump after he put out an ad that aired during the World Series and led Trump to call off trade talks with its North American neighbor and impose new tariffs.

Ontario Premier Doug Ford called it "the best ad I ever ran," Newsweek reports.

The ad featured a clip from former President Ronald Reagan giving a critical take on how tariffs can backfire in foreign trade. An irate Trump threatened to retaliate with a 10% rise in tariffs, which was paused after airing.

“You know why President Trump is so upset right now? It was because it was effective,” Ford said.

Canada is America's second-largest trading ally, with Mexico the leading partner.

Canada and the United States were in the midst of negotiations before the ad aired.

The president's reactions to the ad have sparked a trade war with Canada. Both countries have swapped tariffs against the other, including steel, aluminum, lumber, automobiles and more.

Trump made his announcement last week on Truth Social after seeing the commercial.

The Reagan Foundation said it was "reviewing legal options" over the ad, which was issued by Ontario's provisional government showing video from a 1987 speech by the late president, which the foundation claimed was selectively edited and misleading, and Trump declared "fake."

"They only did this to interfere with the decision of the U.S. Supreme Court, and other courts," Trump posted. "TARIFFS ARE VERY IMPORTANT TO THE NATIONAL SECURITY, AND ECONOMY, OF THE U.S.A. Based on their egregious behavior, ALL TRADE NEGOTIATIONS WITH CANADA ARE HEREBY TERMINATED."