Canadian Foreign Affairs Minister Chrystia Freeland is expected to brief reporters at 4:30 p.m. local time on Friday at the Canadian Embassy in Washington, according to a Canadian government statement.
"If I say no - the answer's no". If I say no, then you're going to [publish] that, and it's going to be so insulting they're not going to be able to make a deal.
The most frequently cited points of deep disagreement included Mexico's bid to safeguard its burgeoning auto sector-Trump's most obvious target-and Canadian resistance to USA demands for more access to Canada's protected dairy market and an end to NAFTA's dispute settlement panels.
However, she said, "discussions continue tomorrow".
Freeland said at a news conference on Friday afternoon that she isn't negotiating with Trump - she's working with Lighthizer.
"The talks were constructive, and we made progress", Lighthizer said.
"Off the record, Canada's working their ass off", Trump allegedly said.
"With good will and flexibility on all sides, I know we can get there".
"I'm working hard and handing out my money", Butler said.
The Commander-in-Chief was speaking with reporters at the White House when he was asked to comment on Trudeau's recent comments that a potential trade deal with the United States could happen by the end of the week.
As negotiations went down to the wire earlier on Friday, Trump, who has been highly critical of Canada's managed dairy market, confirmed he was taking a hardline stance in the talks. Trump wanted the comments to remain private. One Canadian official had told the Star previous to learning of Trump's comments that the USA delegation was not offering "any movement".
Ms Freeland has declined to comment on the specific issues being discussed, saying officials had agreed "we are not going to conduct our negotiation in public". The deal also requires "Mexico to take specific steps to recognize collective bargaining rights".
In August, Trump threatened Canada with auto tariffs if the US and Canada can't forge a deal.
Similarly, Canadian officials tell The Canadian Press today that expectations that a NAFTA deal is imminent are exaggerated and premature.
In a unusual twist on the third day of talks, Ms Freeland emerged from the final late night meeting after only a few minutes, saying she just had a few things to tell Mr Lighthizer. They met late into the evening Thursday, until the talks ended abruptly just after 10 p.m. ET.
When NAFTA and the earlier Canadian-U.S.
In another remark he did not want published, Trump said the deal would be "totally on our terms" and reportedly suggested he had tried to spook the Canadians with the threat of auto tariffs.
After four intensive days of talks in Washington between Canada and the United States, the biggest sticking points were familiar ones: US demands for more access to Canada's closed dairy market and Canadian insistence that a trade dispute settlement system be maintained, not scrapped as Washington wants.
Another lingering sticking point is Chapter 19, set up to resolve disputes among the three countries and industry around how to implement NAFTA rules. "We'll only agree to a deal that's good for Canada. At least Canada knows where I stand!" said Trump.