Being transgender can prevent you from entering the US

A gender-neutral X in your passport can prevent you from entering the US.

For example, if a dual national has a gender-neutral X on their passport, they should check with the US authorities to make sure they are eligible to travel to the US. There is no gender X on a Finnish passport.

The US authorities can refuse entry if the sex on the applicant’s passport is different from the sex established at birth.

A valid Esta or visa does not necessarily entitle you to entry. Overstaying or providing false information can lead to arrest or deportation, the Foreign Ministry said in a press release.