The U.S. ambassador to Canada on Wednesday warned federal and provincial governments to “seriously consider” whether anti- tariff advertising in the United States will help achieve Canada’s goals, adding he thinks the ads amounted to trying to “participate in our electoral politics.”

Speaking at the Canadian Manufacturers and Exporters’ national conference in Ottawa, Ambassador Pete Hoekstra took aim at an Ontario government-funded ad campaign that aired in the U.S. last month and quoted former U.S. President Ronald Reagan criticizing tariffs.

The ad prompted U.S. President Donald Trump to suspend trade negotiations with Canada.

“As far as we can tell, it has never happened in America before,” Hoekstra said, saying Trump and his administration were right to be upset over the ad.

“I

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