The Trump administration is pushing to add legal protections in Nafta that would limit the liability of internet giants such as Google and Facebook, marking the latest in a tug-of-war as policy makers balance policing the web with protecting free speech.
While Japan in particular wants a quick deal on the pact that Trump abandoned earlier this year, Canada says more talks are needed on contentious points.
The constitutional and statutory authority for who can terminate the 1994 North American Free Trade Agreement - Trump or the US Congress - is deeply disputed.
Another round of NAFTA talks wrapped up with all key issues still deadlocked as negotiators prepared to leave Mexico City with a plethora of question marks lingering over the trade deal.
The fatal shooting of two workers in an apparent clash between unions at a Canadian-owned mine in Mexico angered labor activists at NAFTA talks who said the violence was an example of poor labor conditions in the country.
Negotiators from the United States, Mexico and Canada square off for the last time in a fifth round of talks to rework the North American Free Trade Agreement, with stalemate brewing on a contentious proposal to ramp up regional content for autos.
The head of Canada's biggest private-sector union headed to Mexico's Senate, promising to fight at the NAFTA trade pact talks for improved Mexican wages and free collective bargaining as a way of benefiting workers across North America.