OTTAWA— U.S. President Donald Trump said late Thursday he is cancelling all trade talks with Canada over what Trump called a “fake” Ontario ad that wrongly used Ronald Reagan’s words to attack U.S. tariffs.

In a furious late-night post on his platform Truth Social, Trump ripped into an advertisement the Ford government had paid for, saying that it interfered with deliberations of the U.S. Supreme Court on the validity of tariffs, and condemning as “egregious behaviour.”

The post deals a devastating blow to ongoing trade talks which were already stalled as the Carney government seeks to strike sectoral deals on steel, aluminum and energy first. Carney had described those talks earlier Thursday as “very detailed, specific, constructive negotiations.”

But Trump dropped a bombshell hou

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