An Ontario government ad that attracted the wrath of U.S. President Donald Trump was successful — even if it didn’t produce the outcome provincial officials might have anticipated, say experts in political communication.

And, they expect, it will not face any serious legal challenges in the U.S., which allows a lot of latitude when it comes to political commentary.

The ad, which is airing in the U.S., features audio clips criticizing tariffs from a 1987 speech by U.S. President Ronald Reagan. It seems to have incensed Trump, who late on Thursday denounced it as "fake" — abruptly cutting off trade talks and accusing Canada of interfering with an upcoming U.S. Supreme Court decision.

“That ad worked. It was a good ad," said Alex Marland, a professor at Acadia University and the author o

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