Trump adds 10% tariff on Canada due to a TV ad, even though key economic powers law doesn’t allow its use against ‘informational materials’

President Donald Trump’s extra 10% duty on Canada added fuel to the debate over his legal authority on trade, just as the Supreme Court is about to consider a challenge to his global tariffs.

In a Truth Social post on Saturday, he blasted the Ontario provincial government for not immediately taking down a TV ad that features remarks from former President Ronald Reagan criticizing tariffs.

“Because of their serious misrepresentation of the facts, and hostile act, I am increasing...