University of Chicago officials said Wednesday that the visa terminations of three students and four recent graduates were found during an audit. International students at the University of Illinois and Northwestern have also reportedly had their visas revoked.

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. Universities have reported some students being forced to leave immediately,