https://www.techdirt.com/articles/20191203/10473743496/dhs-wanted-to-add-us-citizens-to-long-list-people-subjected-to-mandatory-face-scans-airports-has-backed-down-now.shtml

We knew the DHS would get to this point eventually. Since the beginning of its biometric scanning program rollout, the DHS has planned on adding US citizens to the list of people forced to trade their faces for air travel privileges. So far, the program has been limited to suspicious foreigners (which is all of them, including those here on visas), but a recent filing -- caught by Zack Whittaker at TechCrunch -- says flying in the United States would soon require adding yourself to the government's facial recognition databases.

Homeland Security wants to expand facial recognition checks for travelers arriving to and departing from the U.S. to also include citizens, which had previously been exempt from the mandatory checks.