This paper arose from an invited symposium on Democracy in America: The Promise and the Perils, held at Loyola University Chicago School of Law in Spring 2019. The essay places the Trump administration’s immigration and refugee policy in the context of a resurgent ethnonationalist movement in America as well as the constitutional politics of the past. In particular, it argues that Trumpism’s suspicion of foreigners who are Hispanic or Muslim, its move toward indefinite detention and separation of families, and its disdain for so-called “chain migration” are best understood as part of an assault on the political settlement of the 1960s. These efforts at demographic control are being pursued unilaterally, however, without sufficient evidenc...