What is the primary criticism against a national identification system based on biometric data?

The primary criticism against a national identification system based on biometric data are privacy and security risks. Biometric data are distinctive, measurable chatracteristics used to identify, label and describe individuals. But Biometric security poses huge privacy risks, because once your face, iris or DNA profile becomes a digital file, that file will be difficult to protect. And b iometric identifiers could also be stolen.