President Donald Trump said Saturday the U.S. may be on the verge of a “big trade agreement” with Mexico, as a Mexican official signalled that the thorny issue of energy industry rules seemed to be resolved.

Trump emphasized the collaboration with the current and incoming Mexican administrations. “Our relationship with Mexico is getting closer by the hour,” he tweeted early Saturday. “Some really good people within both the new and old government, and all working closely together.”

Jesus Seade, the envoy of incoming Mexican president Andres Manuel Lopez Obrador, arrived at a meeting with U.S. Trade Representative Robert Lighthizer saying the nations have resolved concerns that the deal had too many restrictions on how the next government can treat foreign oil companies investing in Mexico.

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“It was a rich, fun, important negotiation, from which everything emerged in a very satisfactory way for all involved,” Seade told reporters after returning to Washington following meetings with the incoming administration in Mexico City on Thursday.

“We’ve adjusted the focus very well, but without changing the content, the substance, and we’ve arrived at a solution that should be satisfactory for everyone,” Seade said. “We still need to check technical texts, and I want to be respectful of everyone, but it’s now substantially agreed, with the correct focus.”

The U.S. and Mexico have been holding bilateral talks for weeks, attempting to resolve certain issues before three-country NAFTA negotiations resume.

On Friday, Foreign Minister Chrystia Freeland told reporters: “Canada is very encouraged by the optimism we have heard from our partners Mexico and the United States. I’ve been talking to representatives of those countries a lot this week. They seem encouraged and optimistic about the progress they’ve been making in resolving their bilateral issues.”

She did not provide a timeline on when Canada would rejoin the NAFTA talks, but noted that the issues being discussed by the other partners are “very complicated,” specifically mentioning rules of origin for automobiles.

Seade predicted Saturday that the nations will also agree on a method to update NAFTA without the threat of a so-called “sunset clause,” an automatic expiration after five years — as the U.S. has sought since October.

“We’re negotiating, and it’s going to come out,” Seade said. “It’s no longer what it was for the U.S. in any way. It’s focused on evaluation and continuation.”

Lighthizer’s media office declined to comment on Seade’s statement, and another person close to the talks, who asked not to be identified, said that an automatic expiration after five years remains the U.S.’s negotiating demand. Mexican Economy Minister Ildefonso Guajardo has consistently said that he expects the issue to be one of the final ones to be ironed out, because it requires Canada’s participation.

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Guajardo and Foreign Minister Luis Videgaray also attended Saturday’s meeting with Lighthizer, which Guajardo called “an important day” for the long-running negotiations.

Talks are poised to spill into next week, pushing up against the goal for a deal by the end of the month.

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