This article examines dominant socio-political questions regarding migration, ‘multiculturalism’, and ‘integration’, as a politics of citizenship (and race) in contemporary (post-colonial) Europe. The argument unfolds through a critique of the nationalist complacencies and racial complicities in Jürgen Habermas’s remarks on ‘multiculturalism’ during the 1990s. With recourse to ‘underclass’ discourse, Habermas’s reflections were themselves a trans-Atlantic metastasis of a distinctly US ‘American’ hegemonic sociological commonsense with regard to, but actively disregarding, the fact of white supremacy. Habermas’s thoughts are critically situated alongside their subsequent metastasis, back across the Atlantic, into Francis Fukuyama’s recent invocations of ‘terrorism’ and his advocacy of the ‘American melting pot’ model as a trans-Atlantic prescription for Europe’s ailments. Treating ‘immigrants’ as a kind of societal illness, both are preoccupied by the same ‘problem’ — non-Europeans (as disaffected ‘minorities’). Thus, these discourses of ‘immigration’ manifest a distinctly post-colonial cancer coursing restlessly through the larger social formation of ‘the West’.