A watershed corruption case in Mexico could provide fodder for the government to undo the country’s 2013 landmark energy sector opening, which ushered in millions of dollars in investments and loads of work for lawyers.

Emilio Lozoya, who headed Mexican state oil company Pemex from 2012 to 2016, said in July that opposition legislators were paid to support the energy reform promoted by the government of Enrique Peña Nieto. The bribe money, he said, came from scandal-plagued Brazilian construction firm Odebrecht.