Context
From January 20th, 2025, no new U.S. passports should be issued with an “X” (other/nondisclosed) in the Sex field — whitehouse.gov; CNN; Fox News
However, it remains an open question what will happen to existing U.S. passports that were issued with an “X” in the Sex field, particularly over the short term.
Resolution
This question resolves YES if any existing, unexpired U.S. passport is actually revoked, solely on the basis of its having an “X” in the Sex field, before the deadline(s) given below.
Generally, if a U.S. passport requires renewal or replacement, and its holder is required to select “M” or “F” in the Sex field as a condition of that renewal or replacement, that will NOT cause this question to resolve.
However, if any U.S. passport holder is required by the U.S. passport office to renew their passport solely in order to get rid of an “X” in the Sex field, this question resolves YES.
This question resolves YES if more than 5 unique States contain any international airport, sea port, or border crossing which officially maintains policy to regard passports with an “X” in the Sex field as being invalid.
This question resolves NO at Midnight (US Eastern), January 1st, 2029, if it has not already resolved and Trump is scheduled to continue serving as U.S. President through 2029.
This question resolves NO 24 hours after Trump's successor is inaugurated, if it has not already resolved.