> There are a HUGE number of reasons to think that there should be meaningful controls over what data the government aggregates and accesses, and how that's handled.

This is reasonable in principle. I think that those meaningful data controls should make citizenship and legal immigration status completely public and completely transparent to all parts of the government, as well as to the general public, at all times. So not only should ICE and every single other government agency be able to instantly tell if someone they are interacting with is a citizen, a legal immigrant, or an illegal immigrant - I personally as an ordinary citizen should be able to do the same thing; in the same way that right now I can look up who gave donations to political candidates or parties by name, or look at someone's ID and figure out if it's legal or illegal for me to sell them alcohol.