CNN  —  The Trump administration has revoked hundreds of student visas in nearly every corner of the country as part of a vast immigration crackdown – and few universities know why. More than 1,000 international students and recent graduates at more than 130 schools in the US have had their visas or statuses revoked in the Student and Exchange Visitor Information System this year, according to university statements and spokespeople. Colleges and universities in 40 states have confirmed the visa