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In international relations discourse on security studies, migration was historically marginalized as an area of investigation. It was in the Post-Cold war scenario, that security framing of migration gained major significance. It became a permanent issue of high politics in the aftermath of 9/11. Migration-security nexus is a conceptual framework which helps in the exploration, identification, description and interpretation of security framing of migration in International
relations discourse on security studies. Securitization theory, provided by Copenhagen school of international security studies, provide the suitable theoretical edifice to theoretical conceptualize the conceptual framework of migration-security nexus in International relations theory. This paper is an attempt to establish and explain the theoretical conceptualization of migrationsecurity nexus with the help of securitization theory.