OTTAWA—U.S. Ambassador Pete Hoekstra suggested Thursday the cross-border trade dispute that is roiling the relationship is up to Canada to resolve, but on President Donald Trump’s terms.

Canada must make its best pitch to the U.S. president about how it can help Trump’s economic agenda, Hoekstra said, saying while Canada doesn’t like tariffs, they are a critically important part of Trump’s geopolitical effort to combat globally what the U.S. president sees as “unfair competition.”

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