Prime Minister Justin Trudeau, speaking at the Women in the World summit, was circumspect about the talks, saying only that he remains hopeful.
"At the end of the day, we're neighbors - and at the end of the day, neighbors help each other when they need help", she said.
He and other American politicians have long demanded Canada's system of domestic dairy protections either be abolished or heavily modified to give USA exports a bigger share. Lighthizer did not speak to the press or issue a statement.
"Even if we gave him everything he wanted - and there is no way we would ever do that - who can say whether he'd be satisfied?" said one source, who declined to be identified given the extreme sensitivity of the situation.
But he had a clear message for the prime minister: if the federal Liberal government wants to make a deal, it better start dealing - particularly on the issue of access to Canadian markets for U.S. dairy producers, a critical issue for U.S. President Donald Trump.
"So if we don't find some way to accommodate some of that, then we're not going to have a deal".
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.
"We agreed that it would be useful to continue talking today, so we're back for more negotiations", Freeland told reporters as she entered the USTR offices in Washington.More news: Rashford developing quicker than Ronaldo did - Southgate
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"We're negotiating all this at once".
The two countries will meet in Washington on Tuesday to decide how they'll include the U.S.'s agreement with Mexico into the deal.
Trudeau and his ministers will hold a caucus retreat in Saskatoon, Saskatchewan, to plot their strategy.
"We have been very clear on that, that there can not be more access given", Wiens said in a telephone interview.
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 favorable to the United States. Canadian officials say they are working on the assumption they have until the end of September.
"Forget what you read about NAFTA negotiations and Twitter wars".
Meanwhile, figures provided to CBC News show that Canada collected almost $300 million in July and August after Ottawa slapped USA imports with retaliatory tariffs. While China/US tensions have seemed to support the dollar, with the US seeing as to have the upper hand, NAFTA progress should be CAD and commodities which would ultimately weigh on the greenback and potentially lift the price of gold - well, at least that is what we have seen in the late hours of US trade.
"If (Trump) goes to Congress with a bilateral arrangement with Mexico, he's got problems - real problems", Mulroney said.