The legal details of why Spain's regularisation of irregular migrants was lawful under EU law as it stands, and therefore why responding to it by suspension of Spain's participation in Schengen would have been unlawful
Steve PeersAccession is subject to unanimous voting. Suspension by a group of Member States is subject to a detailed procedure in the Borders Code based on "serious deficiencies" in external border control. Again, as things stand regularisation of irregular migrants is expressly allowed by the return directive