Not much is known about ICE's Mobile Fortify app outside of what's been discovered and reported by 404 Media, which first broke the story of the app's existence, and that's concerning to the Senators.

According to reports, which first surfaced in June, the app has access to more than 200 million images and is able to return data including a person's name, birthdate, nationality, and any dealings with the US immigration system if they aren't a US citizen. The app reportedly also has the ability to capture a fingerprint from a photograph, which can then be run against DHS and Department of State records. Queries can also be performed to connect an identified individual to other people, vehicles, addresses, phone numbers, and firearm ownership, among other data points.