(NewsNation) — President Donald Trump has ordered a sweeping review of all 55 million U.S. visa holders, including students, workers and tourists, for deportable offenses.

The White House said the move is a national security measure, but critics have warned it's the broadest crackdown of its kind in modern American history.

What does this mean for legal visa holders?

The State Department said it plans to review holders for violations of immigration rules, such as overstays, criminal activity and engagement in "terrorist activity."

Officials have referred to the review as "continuous vetting," implying visa holders were never fully cleared.

Early actions already underway

Approximately 6,000 student visas have already been revoked, some for minor infractions and others due to national

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