This article explores how two populist parties in Finland and Ireland articulate their Eurosceptic positions alongside constructions of 'us and them', a hallmark of populism. In recent years, both the Finns Party (Finland) on the right and Sinn Féin (Ireland) on the left have undergone party transformations that include strong anti-establishment narratives and nationalism with increased electoral success. Using a critical frame analysis, this qualitative two-case study examines party speeches and manifestos to argue that Euroscepticism paired with nationalist rhetoric creates a coherent story and a sense of urgency for action that resonates with the public. The paper concludes with thoughts on possible discursive and practical consequences, and suggests directions for future research.