The U.S. State Department said it is scrutinizing the records of all 55 million foreign nationals who hold valid American visas to determine whether any have committed violations that could lead to visa revocation and deportation, according to the Associated Press. A department spokesperson said the effort relies on “continuous vetting,” which allows officials to revisit criminal, immigration and security information that emerges after a visa has been issued. Visas can be revoked at any time if indicators of overstays, criminal activity, threats to public safety or other ineligibilities are found. The review fits within President Donald Trump’s broader immigration agenda, which includes expanding deportations of people in the country unlawfully and tightening oversight of those present legally.