Originally Posted by
joejones
The challenge is proving your US citizenship without a passport. You would most likely need a birth certificate, naturalization certificate, or similar document, which most people don't carry around with them. Driver's licenses and state IDs don't generally contain any citizenship information.
Even without a US passport, CBP at ports of entry can verify my US citizenship status and my identity. The resolution process isn’t much different than the issue when a US citizen with their own valid US passport is mistakenly identified as a false negative match to their passport photo, whether by FRT or manual review — and often it is way easier and faster than when flagged for a false negative match with your very own valid passport photo and photo therein.