Why do individuals vote for nationalist political parties? Existing explanations

focus on domestic-level factors like party systems or economic performance. However, voting

is not solely a product of domestic causes. Thus, I shift focus from the domestic space to

the international arena. Specically, I test whether voters exposed to information about

European Union influence in identity policies (i.e., outgroup policies, like migration/asylum

or the employment of foreigners) are more likely to support nationalists at the ballot box.

Results from a pre-registered, candidate-choice conjoint experiment in Slovakia show that,

while respondents favor nationalist policies generally, reactions to EU influence in identity

politics are limited to certain subgroups. Specifically, respondent ideology plays a moderat-

ing role. Liberals shift towards nationalism in response to EU influence, while conservatives

do not. These findings point to ceiling effects in nationalist voting. Only those who have yet

to reach the nationalist ceiling can be swayed.