Dozens of schools, including the University of California and Harvard, said the Trump administration ended the visas of their students in recent days. For many, the reasons are unclear.

An increasing number of student deportation threats involve the revocation of visas based on relatively minor offenses like years-old misdemeanors, according to immigration attorneys, or sometimes no reason at all.

The Trump administration has revoked hundreds of international student visas nationwide, including those attending colleges and universities in California.