Senator Edward Markey

The senators wrote to ICE in September demanding it stop using facial recognition in the field.

Senator Edward Markey of Massachusetts says there are too many unanswered questions.

For instance, does this system identify just a limited number of wanted people?

Or does it have access to larger databases that can identify the general public?

I don't know, and if I don't know, the Congress doesn't know, and if the Congress doesn't know, the American people don't know.

This is a technology being deployed by the Trump administration against the American people.

Markey and fellow Democrats renewed their request for information on Monday.

ICE has not yet replied, nor did it answer a request for comment from NPR.

Martin Koste, NPR News.