Former federal Canadian trade official Matthew Kronby said the reported American demands indicate to him that the White House doesn't really want to strike a deal with Canada.
Wiens declined to say what action the organization would take if an updated NAFTA deal gave the USA a greater chunk of the Canadian market, but did not rule out campaigning against ratification of the agreement, or the Liberal government.
The US and Canada met for most of last week without reaching a resolution.
Trump has already struck a deal with Mexico, NAFTA's third member, and has said he is prepared to leave Canada out of the revised deal if Ottawa fails to accept terms more favourable to the United States.
Prime Minister Justin Trudeau, speaking at the Women in the World summit, was circumspect about the talks, saying only that he remains hopeful.
Canadian Foreign Affairs Minister Chrystia Freeland speaks to the media as she arrives at the Office Of The United States Trade Representative, Tuesday, Sept. 11, 2018, in Washington. President Donald Trump, in a story that appeared in Automotive News Canada, said Friday that while "I don't want to do anything bad to Canada".
However, there are questions over the value of a trade deal without the key resolution mechanism.
The director of public Affairs of Teamsters Canada, Christopher Monette, who attended behind-the-scenes to the most recent negotiations in Washington, believes that the administration, Trump would not touch the system of supply management, particularly as it relates to the dairy industry.
Wednesday was the first day that negotiations between the two countries resumed after four intensive days of talks last week ended without a deal on Friday after the mood soured.
"I don't think President Trump will go to the mat over Chapter 19".
"Without Chapter 19, NAFTA is utterly useless as it would subject Canada and Mexico to the vagaries of the US political system and its courts when determining trade policy actions", said Derek Holt, vice-president at Scotiabank Economics, in a note recently.
"We have all been dealing in good faith", he said.
Austen, asked whether Freeland might return to Washington later in the week, said no decisions had been taken. "That's not who we are", Craft said in prepared remarks. But a deal without Canada has virtually no chance of being passed, Mulroney said. "They did some very hard work and the discussions over the weekend were, as they were at the beginning of this process, constructive and productive, and we decided it would be a good idea to have a meeting today".
Canadian officials have said they are working on the assumption that they have until the end of September to make a deal. "He's railed against this thing (NAFTA) and they've been at the negotiating table for now over a year".