According to the "Blue Card" (a work and residence permit) scheme approved by the European Parliament on November 20, 2008, all 27 EU member states have the right to

The approval of the "Blue Card" plan by the European Parliament reflects the overall interests of the EU and the supranational nature of the EU; the power to approve the "Blue Card" plan comes from the transfer of part of the sovereignty of member states. Yes, the EU does not have complete national sovereignty, but is only a regional international organization; member states decide the number and work areas of "Blue Cards" based on their own national conditions, indicating that each sovereign country still handles domestic affairs independently.