Cite as: 507 U. S. 292 (1993)
Opinion of the Court
yond those requirements—to give one or another of the child's additional interests priority over other concerns that compete for public funds and administrative attention—is a policy judgment rather than a constitutional imperative.
Respondents' "best interests" argument is, in essence, a demand that the INS program be narrowly tailored to minimize the denial of release into private custody. But narrow tailoring is required only when fundamental rights are involved. The impairment of a lesser interest (here, the alleged interest in being released into the custody of strangers) demands no more than a "reasonable fit" between governmental purpose (here, protecting the welfare of the juveniles who have come into the Government's custody) and the means chosen to advance that purpose. This leaves ample room for an agency to decide, as the INS has, that administrative factors such as lack of child-placement expertise favor using one means rather than another. There is, in short, no constitutional need for a hearing to determine whether private placement would be better, so long as institutional custody is (as we readily find it to be, assuming compliance with the requirements of the consent decree) good enough.
If we harbored any doubts as to the constitutionality of institutional custody over unaccompanied juveniles, they would surely be eliminated as to those juveniles (concededly the overwhelming majority of all involved here) who are aliens. "For reasons long recognized as valid, the responsibility for regulating the relationship between the United States and our alien visitors has been committed to the political branches of the Federal Government." Mathews v. Diaz, 426 U. S. 67, 81 (1976). " '[O]ver no conceivable subject is the legislative power of Congress more complete.' " Fiallo v. Bell, 430 U. S. 787, 792 (1977) (quoting Oceanic Steam Navigation Co. v. Stranahan, 214 U. S. 320, 339 (1909)). Thus, "in the exercise of its broad power over immigration and naturalization, 'Congress regularly makes
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