Before taking office Dec. 1 , Pena Nieto was debating whether to promote a constitutional amendment on Pemex or to rely on smaller legal changes, Luis Videgaray, his then transition team leader and now finance minister, said in an Oct. 26 interview

Since then, Pena Nieto reached an agreement with all major parties to promote both oil and tax legislation this year, even though the proposals lack specifics.

The so-called “Pact for Mexico,” along with the PRI’s likely passage of rule changes this weekend, give Pena Nieto the momentum needed to push for sweeping reforms, said Duncan Wood of the Woodrow Wilson International Center for Scholars.

“It looks like Pena Nieto is going to be given the freedom of action by the party to negotiate broader rather than more restricted reforms,” Wood, director of the center’s Mexico Institute, said in a phone interview from Washington. “The fact they’ve gone through this preliminary stage is a very, very important signal for what they’re hoping to achieve.”