President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on Tuesday attacked Canada for trade rules that he said are hurting dairy producers in the United States, ratcheting up trade rhetoric with the United States' neighbor to the north.

“Canada has made business for our dairy farmers in Wisconsin and other border states very difficult. We will not stand for this. Watch!” Trump wrote on Twitter.

Canada has made business for our dairy farmers in Wisconsin and other border states very difficult. We will not stand for this. Watch! — Donald J. Trump (@realDonaldTrump) April 25, 2017

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The Tuesday morning tweet echoed comments Trump made last week, when he called the dairy issue a “disgrace” and blamed it on the North American Free Trade Agreement.

“What they’ve done to our dairy farm workers is a disgrace. It’s a disgrace,” he said at the time.

The dispute is the latest in Trump’s criticisms of free trade agreements, which he railed against on the campaign trail.

Trump on Monday announced his administration will slap new tariffs on softwood lumber entering the U.S. from Canada.

The Commerce Department said a “countervailing duty” of between 3 percent and 24 percent would be imposed on Canadian lumber exporters.

Commerce Secretary Wilbur Ross said the duties would amount to about $1 billion on softwood lumber, calling it “a bad week for U.S.-Canada trade relations” and blaming the dairy import tax for the move.

Canada responded Monday by vowing to “vigorously defend the interests of the Canadian softwood lumber industry, including through litigation.”

The milk issue is another long-standing dispute.

Canada protects its dairy industry through a set of government controls on production and import taxes. A fight over ultrafiltered milk has recently raised a tempest. U.S. producers had found a market in Canada, but more recently have been priced out as the cost of domestic ultrafiltered milk from Ontario dropped.

This post was updated at 9:56 a.m. on April 26.