March 2025
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International Studies Quarterly
Paradoxically, research on the international dimensions and effects of populism finds that populist leaders’ politicization frequently portrays domestic and foreign “elites” as intertwined—but that their decision-making tends to be considerably more antagonistic vis-à-vis internal opponents than established external actors. Combining structural and agential perspectives, this paper unboxes the individual micro-factors feeding into this paradox by analytically disentangling domain-specific personality traits. To explore whether populist leaders’ individual characteristics vary or remain stable in domestic politics and foreign policy, we conduct a novel domain-specific leadership trait analysis of eleven populist chief executives around the globe. On the one hand, we find limited and rather heterogeneous variation in most individual characteristics, including need for power and conceptual complexity. On the other hand, the great majority of profiled leaders display higher foreign self-confidence and higher domestic distrust. We conclude that particular tendencies toward fearful blanket suspicions of other powerful internal actors and more self-assured case-by-case judgments of external counterparts matter to understand why populist decision-makers often produce confrontational domestic but relatively cooperative foreign policy records. These personality-level inferences support recent IR scholarship about the international opportunities for populist leadership, personalistic foreign policy decision-making, and the primarily domestic logic of intermestic “people-versus-elite” politicization.