U.S. President Donald Trump announced on Thursday that he had terminated trade negotiations with Canada in response to an advert produced by the government of Ontario featuring historic footage of President Ronald Reagan arguing that tariffs undermine economic prosperity.

Ontario has been running a TV ad featuring Ronald Reagan criticizing tariffs. That led President Trump to terminate trade talks with Canada.

Trump attacked the ad on Truth Social Friday posting: “CANADA CHEATED AND GOT CAUGHT!!! They fraudulently took a big buy ad saying that Ronald Reagan did not like Tariffs, when actually he LOVED TARIFFS FOR OUR COUNTRY, AND ITS NATIONAL SECURITY.″

The leader of Canada’s most populous province said Friday he’ll pull the anti-tariff ad that prompted U.S. President Donald Trump to end trade talks with Canada.

President Donald Trump has canceled trade negotiations with Canada over what he called a “fake” ad that featured parts of an anti-tariff speech delivered by conservative hero and former President Ronald Reagan.

At the least, the developments represent an unusually tense application of the foundation’s typical mission, which is to buttress Reagan’s legacy. The situation also highlights the foundation as the latest U.S. establishment institution to be drawn into the controversies of Trump’s aggressive second administration.