Franken had praise for Apple as well as concern.
Despite that, some questions still remain.
The technology works via an infrared system that Apple is calling TrueDepth, which projects a grid of 30,000 invisible light dots onto the user's face, and then further refines the scan as the user tilts and turns their head.
Still, the incident highlights just one of many potential issues users may face in daily use - issues that aren't present on the Touch ID system.
Franken is the Chairman of the Senate Judiciary Subcommittee on Privacy, Technology and the Law.
Franken requests that Apple responds to his questions within a month.
The event was particularly unhelpful for Apple because many have taken it as evidence that the company's facial recognition technology isn't actually read.
After the gaffe, media reports claimed that Face ID failed. "It learns who you are", said Schiller.
Maybe there are other technologies coming up which will reduce the notch, too-some way to get the sensors under the display.
Apple has finally announced its highly anticipated premium smartphone, the iPhone X, but its unveiling did not go exactly as planned. The on-stage fail was such that according to Vice News, Apple shares immediately fell by two percent after Face ID failed to work not once but twice. After a second attempt, the Apple exec had to switch to the backup phone on-stage, which worked as intended. "Face ID worked as it was created to".
This led to a swathe of comments online questioning Face ID's reliability, giving rivals succour after Apple unveiled its most exciting iPhone in years.
If Apple is telling the truth, all that engineering makes for a pretty secure device, and that's a pretty solid selling point if your organization deals with sensitive information.
Also, because of the artificial intelligence in tow, Face ID is better prepared against being conned by a 3D mask, a photograph or even a selfie of you taken on another phone. The iPhone X will start shipping to India from November 3 and we could only see whether the FaceID is all worth its hype or not.