During Fox's administration, Mexico pushed for "comprehensive" reform of U.S. immigration law that addressed the problem of Illegal immigration to the United States. The issue had been called "The Whole Enchilada" by Fox's administration, which stated that "immigration reform in the United States should address mutual border problems, the rights of undocumented immigrants, and the development of regions in Mexico that 'expel' migrants". However, according to former U.S. ambassador to Mexico Jeffrey Davidow, all discussions between the parties on immigration were informal.