The president said Saturday on Twitter that there was "no political necessity" to keep Canada in NAFTA.
"The U.S. has tremendous upside potential as we go about fixing some of the worst Trade Deals ever made by any country in the world".
In Charlotte, Trump added that if the USA does not reach a deal with Canada, "that's just fine", offering a variation of one of the lines leaked to the Toronto Star paper: "I say affectionately, we'll just have to tariff those cars coming in, that's a lot of money coming into the coffers of the United States".
Trilateral trade between the NAFTA countries has exceeded one trillion dollars annually in recent years, according to a 2017 report by the US Congressional Research Service.
Trumka, whose organization is an umbrella group for most unions, said the economies of the United States, Canada and Mexico are "integrated" and 'it's pretty hard to see how that would work without having Canada in the deal'.
On Twitter, Trump posted, "Wow, I made OFF THE RECORD COMMENTS to Bloomberg concerning Canada, and this powerful understanding was BLATANTLY VIOLATED".
The move came after Trumka said in a TV appearance that a renegotiated trade deal to replace NAFTA should include Canada - the nation's largest trading partner and the source of many auto manufacturing jobs for US firms. "Congress' refusal to ratify a deal without Canada in it weakens Trump's hand, so to achieve his ends, he's attempting to bully not only Canada but the U.S. Congress as well", he wrote in an email.
Trump continues to bash Canada amid NAFTA negotiations
Prime Minister Justin Trudeau, left, reached out to former prime minister Brian Mulroney, centre, about the NAFTA negotiations. Trump on Saturday, in his Twitter posts, reprised his attacks that NAFTA has resulted in a loss of U.S.jobs and business.
"The talks were constructive, and we made progress", Lighthizer said.
Turkey's lira has suffered in the wake of us sanctions and tariffs instituted in response to the imprisonment of American pastor Andrew Brunson. But many manufacturers responded to the agreement by moving factories south of the border to take advantage of low Mexican wages, then shipping goods north to the United States and Canada.
"Our officials are continuing to work toward agreement", US Trade Representative Robert Lighthizer said in a statement, stressing the benefits to US workers and businesses.
A few weeks ago, the United States began negotiating with Mexico, leaving Canada on the sidelines. The U.S. must give six-months notice to both Canada and Mexico if it intends to pull out of the deal.
According to The Wall Street Journal, the dispute between USA and Canada hinges on agricultural and media protection policies, as well as the installation of a system that would allow any of the three countries in the agreement to challenge tariffs imposed by one of the others.
"We know that a win-win-win agreement is within reach", Canadian Foreign Minister Chrystia Freeland told reporters after a week of talks to rewrite the 25-year-old Nafta. He added, "The Worker in America is doing better than ever before".
One individual pointed out that when it comes to hypocritical support of American workers, Trump is not alone.