Talking about Europe? Explaining the salience of the European Union in the plenaries of 17 national parliaments during 2006-2019

To provide accountability, Members of Parliament (MPs) are expected to publicly communicate European Union (EU) affairs. Yet, parliamentary communication of EU affairs remains underexplored and existing analyses are conflicting. Against this background, this article sheds light on what drives MPs to talk about the EU, utilizing a novel dataset based on over 20,000 plenary protocols from 17 parliaments during 2006-2019. The study highlights that EU mentions increase in connection to referendums, summits, treaty ratifications, and European elections. Additional drivers include transfers of authority to the EU level, EU legislation, and political incentives. The findings provide some nuance to more pessimistic evaluations of the EU's accountability deficit, but major legitimacy challenges remain concerning national elections and Eurozone integration.