Canada would view any tariffs on steel or aluminum as unacceptable and will take appropriate measures to defend workers and industries if needed, Foreign Minister Chrystia Freeland said on Monday.

The latest trade deal talks with her Mexican and US counterparts have ended in Mexico City with little success.

Prime Minister Justin Trudeau has told President Donald Trump tariffs will hinder renegotiation of the 1994 North American Free Trade Agreement (NAFTA).

Al Jazeera's John Holman has more.