The Spanish opposition has leaned into a theory that the government's recent blanket regularisation of over up to 800,000 undocumented migrants is a ploy to "alter the electoral register" in its favour. Q&A: How Spain's mass regularisation of undocumented migrants will workMadrid President Isabel Díaz Ayuso has gone further and described the regularisation of migrants as "a trap" that "could alter the electoral roll". Spain's government recently approved a decree which will give at least 500,000 undocumented migrants the right to work and reside in the country. But according to the Funcas think-tank around 840,000 undocumented migrants lived in Spain at the beginning of January 2025. READ MORE: The 10 migration laws that will impact foreigners if Spain's PP reaches power