Mexico is looking toward strengthening trading deals with other countries should the talks to renegotiate the North America Free Trade Agreement fail, said a source with knowledge of the country’s plans who requested anonymity.

The shift comes as the talks, the fourth round of which is set to begin in Mexico City in mid-November, appear to be teetering. Canadian and Mexican negotiators have slammed the U.S. demands as excessive, while U.S. Trade Representative Robert Lighthizer has complained that the trading partners are being inflexible.