The U.S. State Department’s continuous vetting applies to “all of the more than 55 million foreigners who currently hold valid U.S. visas,” a department official said on Thursday, including those who have already been admitted to enter the country.

“The State Department revokes visas any time there are indications of a potential ineligibility, which includes things like any indicators of overstays, criminal activity, threats to public safety, engaging in any form of terrorist activity, or providing support to a terrorist organization,” the official said.

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(Reporting by Humeyra Pamuk in Washington and Bhargav Acharya in Toronto; editing by Rami Ayyub)