Trumka's comments come after Trump warned Canada on Saturday that it "will be out" of a revised NAFTA deal unless it's "fair" to the USA, and threatened to scrap the current deal should Congress "interfere" with the negotiations.
U.S. President Donald Trump said in off-the-record remarks to Bloomberg News this week that any trade deal with Canada would be "totally on our terms", the Toronto Star reported on Friday, citing remarks it had obtained.
Trump tweeted that the U.S. was "far better off before Nafta - should never have been signed".
It is still unclear whether the United States and Canada will work out their differences in the next few weeks.
"I love Canada, but they've taken advantage of our Country for many years!"
Replacing NAFTA is a top priority for Mr. Trump, who calls the landmark trade agreement "the worst deal ever made".
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People at the venue saw a string of sheriff's and police cars responding to the fairgrounds around 6:40 p.m. No other details were immediately available, and police are yet to release any information on the incident.
NAFTA talks pick up as deadline nears for US, Canada
Late Tuesday, the Globe and Mail reported that Ottawa was prepared to make concessions to Washington on Canada's dairy market. The prime minister said Canada is "determined to conclude an agreement that's equitable for all the concerned parties".
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Canada's Foreign Minister Chrystia Freeland held four meetings with US Trade Representative Robert Lighthizer to try to bridge differences to preserve the three-nation trade pact with the US and Mexico. I am used to it. The only problem was that the announced deal was between only the US and Mexico.
The deal brokered between Mexico and the USA has many provisions that have earned the support of organized labor, including more robust rules for automobile production.
Union membership nationwide has fallen markedly from the 1970s, with the percentage of American workers in a union dropping from about 25 percent in the 1970s to less than 11 percent in 2017, according to survey data. For various political reasons on both sides of the Rio Grande, it was critical that the trade deal be officially presented to Congress by end of the week, so getting Canada on-board became an immediate priority.
Trump wants to get a trade deal finalized by 1 December. According to a study on the deal effects back in 2013, NAFTA was directly responsible for raising the United States trade deficit with Mexico from $17 billion to $177 billion, and cost the United States over 850,000 jobs.
Experts have said the flashpoints include trade barriers that protect Canadian dairy farmers and Ottawa's insistence on keeping Nafta provisions for resolving disputes. Trump, in those comments, said that he was taking a hardline stand in trade discussions with the U.S.' northern neighbor.
"The updated NAFTA agreement, especially the US-Mexican deal will be supported by business for nearly the relief it gives because the uncertainty was killing investment plans", according to Simon Evenett from St Gallen University in Switzerland. "If we don't make a fair deal for the USA after decades of abuse, Canada will be out".
Mr. Trump wants Canada to end its tariffs on dairy products, which can run almost 300 percent.
For Canada, losing access to the USA market would be a severe economic blow.