https://www.siliconvalley.com/2019/12/02/homeland-security-wants-to-scan-us-citizens-faces-too/

The Department of Homeland Security wants to be able to use facial-recognition technology to identify all people entering and leaving the United States — including US citizens.

In a recent filing, the DHS proposed changing existing regulations “to provide that all travelers, including US citizens, may be required to be photographed upon entry and/or departure” from the United States, such as at airports.