The U.S. Embassy in Ireland wishes to remind all Irish passport holders who are able to travel to the United States via the Visa Waiver Program (VWP) that as of 01 April 2016, they must have a valid electronic passport.
This rule applies even to those who possess a valid Electronic System for Travel Authorization (ESTA). The U.S. Embassy strongly recommends that all travelers check to ensure their passports are valid electronic passports before they make arrangements to travel to the United States on the Visa Waiver Program.
You can check if your passport is valid for travel under the VWP by carefully reading the following page: https://travel.state.gov/content/visas/en/visit/visa-waiver-program.html.
Any traveler who does not have a valid electronic passport is still eligible to travel to the United States with a valid nonimmigrant visa issued by a U.S. embassy or consulate. Such travelers will be required to appear for an interview and obtain a visa in their passports at a U.S. embassy or consulate before traveling to the United States.
If you do not have imminent travel plans, you should pay the nonimmigrant visa application fee, fill out the DS-160 nonimmigrant visa application form and schedule a visa appointment. If your travel is imminent and urgent in nature, you may request an expedited visa appointment.