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
It's the third time in the last week that Trump has bashed America's northern neighbor and close ally for its rules on imported dairy products.
Trump made similar remarks in Wisconsin last Tuesday, calling the dairy trade relationship between the United States and Canada "very, very unfair."
"We're also going to stand up for our dairy farmers in Wisconsin," Trump told the crowd. "I've been reading about it and I've been talking about it for a long time and that demands, really, immediately, fair trade with all of our trading partners."
"That includes Canada, because, in Canada, some very unfair things have happened to our dairy farmers and others," Trump continued. "It's another typical one-sided deal against the United States and it's not going to be happening for long."
Halting business from moving overseas has been a key promise of Trump's early presidency.
The comments precede the upcoming renegotiation of NAFTA, expected this summer. The U.S. has been at odds with Canada over other imports, as well; one of the largest disputes has been about softwood lumber imports from Canada to the U.S. On Monday, Trump told media attending a reception that he would impose a 20 percent tariff on imports of the Canadian product.
Secretary of Commerce Wilbur Ross told reporters in today's White House briefing that even though Canada is a "good neighbor, that doesn't mean they don't have to play by the rules." He went on to say "there may be a small increase" in lumber prices because of the tariff.
Ross added that it's not a matter of "Trump messing with the Canadians," but rather, the White House believes "they violated legitimate practice."
The tariff would be "collected on a retroactive basis going back 90 days," Ross added.
ABC News' Katherine Faulders contributed to this report.