This study examines those factors that influence the issuance of reasoned opinions within the European Union’s ‘Early Warning System’. It is posited that greater aggregate public Euroskepticism results in the issuance of more reasoned opinions. This expectation is tested using data derived from the European Parliament, the Commission’s platform for European Union Interparliamentary Exchange, and longitudinal data from the Eurobarometer survey series. It is found that greater aggregate public Euroskepticism is associated with the issuance of more reasoned opinions. This study has important implications for our understandings of policy processes, political responsiveness, and democratic governance in the European Union and its member states.