Trump: Canada 'trying to illegally influence' Supreme Court on tariffs

President Trump defended his decision to call off trade negotiations with Canada on Friday, accusing the U.S.'s northern neighbor of attempting to "illegally influence" a pending Supreme Court case over tariffs.

"CANADA CHEATED AND GOT CAUGHT!!!" Trump posted to Truth Social. "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."

"Canada is trying to illegally influence the United States Supreme Court in one of the most important rulings in the history of our Country," Trump wrote.

In a second post, the president suggested the U.S. is "WEALTHY, POWERFUL, AND NATIONALLY SECURE AGAIN" because of his tariffs, and called the looming case, "THE MOST IMPORTANT CASE EVER."

In a third post, Trump argued that the stock market was now "STRONGER THAN EVER BEFORE BECAUSE OF TARIFFS!"

The latest clash between Trump and Canada began with an ad campaign launched earlier this month by Ontario Premier Doug Ford. The advertisement shows former President Reagan delivering an address in 1987 about the tariffs on Japanese imports and warning against the risks of long-term trade disputes.

“High tariffs inevitably lead to retaliation by foreign countries and the triggering of fierce trade wars. Then the worst happens,” Reagan said in the ad. “Markets shrink and collapse, businesses and industries shut down, and millions of people lose their jobs.”

In response, Trump said Thursday: "ALL TRADE NEGOTIATIONS WITH CANADA ARE HEREBY TERMINATED."

In late July, the president announced a 35 percent tariff on all goods from Canada, except for products covered under the 2020 U.S.-Mexico-Canada (USMCA) trade agreement.

Trump has suggested that U.S. does not need Canadian goods to thrive, despite Canada's status as one of the U.S.'s top trading partners. He has also claimed Canada is more reliant on the U.S. for its economy.

“There’s still great love between the two countries, but you know American people want product here, they want to make it here,” Trump said during a meeting with Canadian Prime Minister Mark Carney at the White House earlier this month.

“We are competing for the same business," he added at the time. "That’s the problem.”