The seventh negotiation round of the North American Free Trade Agreement (NAFTA) is concluding here today without results and torpedoed by the United States, particularly the preparation of the trade war of President Donald Trump.

The controversial issue of the automotive sector's rules was pending after the U.S. negotiating chief on that matter, Janson Bernstein, abruptly left the event one week ago and practically cut his peers in Mexico and Canada off in mid-sentence.

Bernstein was called to a consultation meeting between the Trump government, including his business representative, Robert Lighthizer, and companies such as Ford, General Motors and Fiat Chrysler Automobiles.

Jerry Dias, president of the Canadian trade union Unifor, described as absolutely disappointing the results of the meeting in Mexico, which was also surprised by Trump's announcement that he will impose tariffs on steel and aluminium imports.

And above all, his partners in NAFTA, Mexico and Canada, will not be exempt from that decision.

The U.S. president even said that a trade war over the issue of these tariffs 'would be fine', which left many questions about the future of the NAFTA.