I don't know the details of the proposed law, but there is a difference between collecting biometric data for the purposes of identification and for the purpose

I don't know the details of the proposed law, but there is a difference between collecting biometric data for the purposes of identification and for the purposes of mass-surveillance. It's about how and when the data is used. Biometric passports store a literal JPEG of your face, fingerprint, or iris on the chip, and it's up to the software on the entry gate/computer/phone to make the comparison between what's on your passport and your challenge. Even if both the original info on the passport and challenge data are sent to a central server for processing (or even if they are compared against the info in a centralized database), it's still being used to identify an individual. Besides that, the moment and circumstances of this identification are clear and regulated: a border crossing, a police stop, etc. This is quite different then using a network of CCTV cameras to look for particular individuals... or keeping track of how all individuals move through an area with CCTV footage, so that you can analyze behavior (or look for individuals after at a later date).