She said she spoke with Lighthizer over the weekend and they agreed it would be useful for them to meet again face to face.
"We have been very clear on that, that there can not be more access given", Wiens said in a telephone interview.
"Having said all of that, nothing is done until everything is done" - and that says it all really, but USA officials have said time is running out to agree on a text that can be signed by American, Canadian and Mexican leaders by November 30, before the current Mexican government leaves office.
The two sides have so far been unable to break an impasse over, among other issues, USA access to the Canadian dairy market, a cultural exemption for Canada and the Chapter 19 dispute resolution mechanism.
Yet, he stressed that "if we sign the deal it'll be. for Canada and Canadians".
Lighthizer and Canadian counterpart Chrystia Freeland returned to the negotiating table for one day Tuesday before she jetted off to Saskatoon to brief the prime minister at this week's caucus gathering, which wraps up Thursday.
"We are better off having no NAFTA than a bad deal for Canada", Trudeau told reporters on Tuesday, stressing that he would defend the country's dairy industry.
"That has been the right decision", Freeland said late Tuesday of the mutual agreement to avoid publicly disclosing details of the talks. Eares are on the ground for U.S. and China developments but at the fore again was the NAFTA negotiations.
Packers receivers come up huge in comeback win over Bears
Then he picked off a Kizer screen pass and returned it 27 yards for a touchdown that gave the Bears a 17-0 lead. But it all culminates in the suddenly much-anticipated Bears-Packers get-together on "Sunday Night Football".
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.
"Forget what you read about NAFTA negotiations and Twitter wars".
Dairy has been singled out as a key hurdle, including on Friday when Larry Kudlow, a senior economic adviser to Trump, said in a Fox Business Network interview that what "continues to block the deal is m-i-l-k".
A late day comment from Pres. Trump boosted the precious metal and the Canadian dollar where he said "Trade talks going well".
Canada and the USA are trying to finalize a text that could be submitted to Congress by the end of the month to join the deal the Trump administration signed with Mexico.
"I think we understand there are certain issues on which we will need to compromise", one of the sources said when asked about increased dairy access for the USA industry.
Freeland spent three days in Washington last week and said on Friday as she prepared to leave that she and Lighthizer were making very good progress in some areas, although a deal remained out of reach.
"If (Trump) goes to Congress with a bilateral arrangement with Mexico, he's got problems - real problems", Mulroney said.