This study focuses on why radical right populists are anti-immigrationists and what would have been the main implications of this opposition. The emphasis on antiimmigration is crucial for radical right populism literature; almost every study points out xenophobia (in general) and anti-immigration (in particular) as characteristic features of radical right populism. This study aims to contribute to the literature on this field in two ways: First, by including recent issues, and second, by presenting the radical right populist perspectives’ opposition to immigration with a proposal of four-axis classification. Although this classification is not definitive, it would provide a systematic and holistic assessment of why radical right populism advocates an exclusionary approach, attitude, action, and policy towards immigrants. Within the scope of the study, this classification consists of crisis politics, election instrument, Islamization phobia and ressentiment dimensions. It has been concluded that with these four dimensions, if radical right populism’s anti-immigrant attitudes, actions and policies would become widespread among the local population and start to be expressed with louder voices, it would create an exclusionary, criminalizing and discriminatory atmosphere toward immigrants and refugees.