Federal agents detained a Columbia University student early Thursday; hours later she was released after President Trump intervened following a meeting with New York City Mayor Zohran Mamdani. The arrest, which Columbia says involved agents claiming they were searching for a “missing person,” touched off protests and renewed scrutiny of immigration enforcement on campuses. Legal observers and campus leaders questioned the tactics used by ICE and DHS, noting federal agents have no special privileges on university property and must generally show warrants or meet clear legal standards. The incident has prompted calls for clearer campus protocols and stronger legal protections for students and university staff. Universities nationwide are monitoring the case for implications on visitor access, campus security training, and relationships with federal law‑enforcement agencies. The episode also amplifies concerns about student mental health and campus climate when immigration enforcement intersects with academic life.