"There's a historic reluctance by Canada to engage seriously with Mexico," said Carleton University professor Laura Macdonald. "And there's a tendency for them to fail when they try to work together."

We have the trade deal with the United States, Canada and Mexico... There is no need,' Mexican President Claudia Sheinbaum said Wednesday.

Former diplomat and NAFTA negotiator Colin Robertson on the significance of Canadian ministers visiting Mexico for trade talks.