Some international students are suing the U.S. government after their visas have been cancelled. Many of them say they have never been convicted of a crime. The State Department is revoking international student visas over alleged campus activism. But universities report the cancellation extends far beyond these cases, with many other students now facing deportation. Many students tell NPR, their visas were canceled without explanation, raising questions about the true scope and scale of the government's crackdown. NPR's Emily Feng reports.
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