Former U.S. ambassador to Canada Bruce Heyman ripped President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Friday for his treatment of Canada in trade negotiations.

"The definition of insanity … is how the president has been treating Canada all this time," Heyman said on CNBC's "Squawk on the Street."

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"You know, this is our best trading partner in the world."

Heyman, who served in the Obama administration from 2014 to 2017, cautioned that Trump's actions could damage the relationship between Canada and the U.S. for "much longer than it will take the ink to dry" on a new North American Free Trade Agreement deal.

"When you take your best friend, your greatest ally in the world, and start squeezing them, you can win," Heyman added. "But I will tell you, the relationship will be damaged much longer than it will take the ink to dry on a new NAFTA deal."

His comments come amid tense, ongoing trade negotiations between the U.S. and Canada.

The two countries failed on Friday to reach a final deal on NAFTA. Canadian Foreign Minister Chrystia Freeland told reporters on Friday afternoon that the U.S. and Canada will continue to work toward a deal.

"Once we have a good deal for Canada we'll be done," she said.

Talks between the nations unraveled as the Trump administration moved to begin a new trade agreement with Mexico to replace NAFTA.

Without Canada in agreement, an updated NAFTA deal will not pass through Congress.

The Toronto Star reported that Trump told Bloomberg News, in comments made off the record, that he would not compromise with Canada at all when it comes to trade negotiations.

It is unclear how the Star obtained Trump's comments on trade, which Bloomberg did not publish. The president appeared to confirm in a tweet Friday that the comments reported by The Star were accurate.