The Trump administration has revoked hundreds of international student visas across the country, setting off a desperate scramble for them to leave the United States within days.

Universities have reported some students being forced to leave immediately, in many cases after discovering their visas were canceled in the federal Student Exchange and Visitor Information System or via an unexpected text or email. Multiple universities contacted by the USA TODAY Network regarding the visa cancellations declined to discuss specifics, citing student confidentiality.

Immigration experts said they've never seen the federal government make such sweeping changes to the ordinarily low-profile process of hosting international students. The National Immigration Project is challenging the visa cancellations, which have affected students in California, Colorado, Kentucky, Ohio, Michigan, Massachusetts and Florida, among others.

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