WASHINGTON (Gray DC) - President Donald Trump announced on Thursday that he is ending “all trade negotiations” with Canada because of a TV ad campaign that was critical of his tariffs.

The president made the announcement on Truth Social after province of Ontario paid for the campaign, featuring former President Ronald Reagan speaking negatively about tariffs.

The ad features part of an 1987 radio address given by the former president, with quotes of him speaking out against tariffs.

President Trump wrote that the ad was created to interfere with the decision of the Supreme Court, which is considering a legal challenge to the Trump tariffs. He also called the ad “fake.”

The Ronald Reagan Presidential Foundation & Institute said in a statement that the ad misrepresents the former president’s address and said that the government of Ontario never got permission to use or edit his remarks. The foundation did not specify what was misrepresented in the ad.

Later on Friday morning, Canadian Prime Minister Mark Carney responded to the president’s comments on the trade negotiations.

“Our officials, my colleagues, have been working, with their American colleagues on detailed constructive negotiations, discussions on specific transactions, specific sectors” said said the prime minister. “...steel, aluminum and energy. A lot of progress has been made and we stand ready to pick up on that progress, and build on that progress, when the American are ready to have those discussions.”

The fallout of the president’s comments on ending trade negotiations with Canada could be significant. Canada is America’s second largest trading partner, with $2.5 billon of goods and services crossing over the northern border every day.