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This study examines when and why members of the European Parliament ( EP) use parliamentary questions as a form of fire alarm oversight. We argue that the multilevel nature of the EU political system allows members of the EP from national opposition parties to use parliamentary questions to alert the European Commission to governments' failures to implement EU policy. Representation in the EP provides the only avenue for such oversight for national opposition parties. Using a new sample of EP parliamentary questions, we demonstrate that MEPs from national opposition parties are more likely to alert the Commission to violations of EU law in their own member states. These parliamentary questions may lead the Commission to take legal action against member-state governments. [ABSTRACT FROM AUTHOR]

Recent research on the European Parliament (EP) has neglected the idiosyncrasies of niche parties. Similarly, analyses of niche parties have not fully engaged the literature on the EP. This article builds on both literatures by analysing niche party behaviour in the EP as a distinct phenomenon. It is argued that niche parties will respond differently to institutional stimuli than parties more generally. To test this argument, Hix, Noury and Roland's work on EP party voting behaviour is replicated concentrating on niche parties only. It is found that participation in national government and institutional changes affect niche party legislators' voting behaviour, whereas they do not for legislators in the EP overall. These results have important implications for understanding both party behaviour in the EP and niche party behaviour more generally. [ABSTRACT FROM AUTHOR]