Ireland is the latest European country to update travel advice for the US.

The Irish Government website has updated travel advice for anyone heading to the US.

The site issued guidance for transgender travelers, stating that US ESTA and visa application forms require travelers to declare their sex, which should reflect their biological gender assigned at birth.

Travelers who have an X marked on their passport, or those whose gender is different to the one assigned at birth, are advised to contact the US Embassy in Dublin for more information on entry requirements.

This comes as a response to US President Donald Trump's clampdown on transgender rights.

Returning to office less than 100 days ago, the 78-year-old President has enacted a series of executive orders rolling back rights for transgender and nonbinary individuals.

On his first day back in the White House, President Trump signed an order that declared that the government would recognise only two genders, male and female.

Since his return, transgender citizens in the US have already been impacted by the order, with their driver's licenses and passports all reflecting their biological sex.

The update comes after other European countries have made a similar move.

Finland, Denmark, the UK, and Germany all updated US travel advice in response to President Trump's signing of the order.