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“When applying for an ESTA or visa to the United States, there are two gender designations to choose from: male or female,” the Danish travel advisory stated in an update Friday.

“If you have the gender designation X in your passport, or you have changed your gender, it is recommended that you contact the U.S. Embassy prior to travel for guidance on how to proceed," the ministry advised.

While the travel advisory does not explicitly mention the new U.S. administration, it comes only weeks after President Donald Trump signed calling for the federal government to define sex as only male or female and for that to be reflected on official documents such as passports and policies such as federal prison assignments.

The U.S. State Department has preferred by many nonbinary people, who don’t identify as strictly male or female. The department also stopped allowing people to change the gender listed on their passport or get new ones that reflect their gender rather than their sex assigned at birth.

The head of the transgender group LGBT+ Denmark, Susanne Branner, told Danish radio RadioIII her group had reached out to the country's foreign ministry earlier in the week and asked for the update of the advisory.

She said there are a few thousand people in Denmark who have changed their legal gender and who might encounter unpleasant situations at airports when trying to enter the U.S. or could even be denied entry because their passports do not reflect the gender assigned at birth.

“If you are transgender or have an X in your passport, can you risk being denied entry? We would like concrete answers to this,” Branner told RadioIII.

Other European countries have also changed their official advisories for members of the transgender community in a reflection to the situation in the U.S.

The foreign ministry put out an advisory earlier this month, telling “travelers who have the gender entry ‘X’ or whose current gender entry differs from their gender entry at birth” to contact a U.S. diplomatic mission in Germany “before entering the country and find out the applicable entry requirements.”

, too, advises prospective U.S. travelers on its foreign ministry homepage that if their “current gender as recorded in their passport differs from the gender they were assigned at birth, U.S. authorities may deny entry. It is recommended that you check with U.S. authorities in advance for entry requirements.”