But in the last year, the Administration has transformed the agency’s mission and work into something unrecognizable. As I report in my latest piece, which is out today, U.S.C.I.S. is now a central part of the President’s immigration crackdown. Permanent-residency applications from more than seventy countries have been frozen, naturalization ceremonies cancelled. When spouses of U.S. citizens have shown up for routine green-card interviews, they’ve been arrested; others in the middle of applying for their legal status are getting detained and, in some cases, deported outright. The agency is beginning a sweeping campaign to denaturalize large numbers of citizens, aiming to strip them of their legal status; officials have monthly quotas for how many cases they must flag for review. As one former senior official told me, “turning U.S.C.I.S. into an enforcement arm is making it seem like the reason we have an immigration system is to keep people out.”