Juan Carlos Baker, Mexico’s deputy commerce minister, said Friday that his government may not sign the final text of the United States-Mexico-Canada Agreement on trade if the U.S. does not agree to provide exemptions to its tariffs on steel and aluminum.

The Trump administration is balking at that demand, however, as its counter-proposal, a quota system, is getting the cold shoulder from both Mexico and Canada, which is also seeking an exemption from the tariffs.