(Washington, D.C.) -- The TSA is testing facial recognition technology in 16 major airports and wants to expand its use. Oregon Senator Jeff Merkley is joining other Democratic Senators in calling on the TSA to stop using facial recognition technology. Merkley says it's a risk to civil liberties and privacy rights. The TSA says the scans are not mandatory, but the Senators say it's unclear how the travelers will know they can opt-out. Studies also show the technology can racially discriminate, because Asian and African American people were up to 100 times more likely to be misidentified.