[geofft]

Why? What makes it reasonable to search all passengers on a plane to find an undocumented immigrant, that wouldn't also make it reasonable to search all passengers on a bus, or all congregants at a church, or all pedestrians at a crosswalk, or similar?

What happens if I don't have my citizenship papers with me? Is ICE going to take my word that I'm not the person they're looking for and I'm actually a citizen?

Why should I, a natural-born US citizen, be obligated to carry my citizenship papers around with me in any of those situations just in case ICE decides to show up? I have certain rights as a US citizen, and one of those is that I expect to be able to travel domestically without carrying my papers and without ICE detaining me.

[zaatar]

That you're a natural-born citizen is completely irrelevant; naturalized citizens are no less entitled to the exact same rights less serving as POTUS. See the supreme court ruling from Luria v. United States, 231 U.S. 9 (1913). Link: https://supreme.justia.com/cases/federal/us/231/9/case.html