Controlling Subsidiarity in Today's EU: the Role of the European Parliament and the National Parliaments

Since the entry into force of the Lisbon Treaty (2009), the EU national parliaments have had the right to control the principle of subsidiarity through the Early Warning System (EWS). This study, commissioned by the European Parliament’s Policy Department for Citizens’ Rights and Constitutional Affairs at the request of the JURI Committee, examines how the EWS has worked over the past 12 years. It also looks into the interaction of the European Commission, local and regional entities, the Committee of the Regions and the Court of Justice of the EU with national parliaments to this end.