"People don't realize Canada has been very rough on the United States. Everyone thinks of Canada as being wonderful. And so do I. I love Canada. But they have outsmarted our politicians for many years, and you people understand that. So, we did institute a very big tariff on lumber."

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It does sound like a surprise, but it shouldn't be surprising. The Canada-U.S. trade relationship is still the world's largest. And a relationship that size always generates disputes. And this particular dispute on lumber tariff didn't fall out of a clear spring sky. It's been going on for literally decades. It's rooted in the different way Canada and the United States charges forestry companies for the trees that they cut down and turn into lumber.

— Donald Trump