[pjc50]

.. that seems extremely dangerous, because I wouldn't trust that refusal to not raise red flags for the rest of your life. I've not heard of people routinely doing this or announcing it as a valid method of proof of citizenship which they accept.

[tenacious_tuna]

Agreed, that seems like exactly the thing that would get you pulled aside at the border, and/or give ICE a reason to not trust your American passport.