UPDATE: Canada, U.S. in Weekend Blitz to Reach Accord on NAFTA

Mexico and the U.S. postponed a Friday night plan to publish details of their tentative trade deal to replace the North American Free Trade Agreement, thereby giving negotiators a chance to include Canada in the pact by Sunday night.

Mexico and the U.S. announced a provisional agreement late last month to update NAFTA. But separate talks to include Canada have repeatedly stumbled. Mexico is eager to get an accord approved before its new president takes office on Dec. 1.

Reports say U.S. and Canadian envoys are meeting through weekend in a last-ditch attempt to complete a trilateral tentative agreement by Sunday night. U.S. trade rules require that the text of such a pact must be publicly available for 60 days before the president can sign it.

President Donald Trump has been saying for weeks that he will push ahead with the Mexico deal and perhaps add Canada later. Trade experts say that option is viable. Trump also has repeatedly threatened to begin imposing a 25% import tariff cars from that country if a deal fails to materialize.

It isn’t clear how willing Congress would be to approve a replacement for NAFTA that excludes Canada. Legislators from both parties have indicated they strongly prefer a trilateral agreement.