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Ha, ok, is there a bit in The Critique of Pure Reason about refugees? Haven't read the whole thing tbh
Kant wrote an enormous amount of philosophy, and for direct relevance you probably want to consult the political works. As with May's ignorant dismissal of the idea of a 'citizen of the world', which she evidently hadn't understood, there are many parts of it which are currently being experimented against by the petulant children of the reaction.
And there we go!