Visa Waiver Program Improvement and Terrorist Travel Prevention Act of 2015. Travelers in the following categories must obtain a visa prior to traveling to the United States as they are no longer eligible to travel under the visa waiver program. Nationalities of VWP countries can apply for visas using regular appointment processes at a U.S. Embassy or Consulate. For those who require a visa for urgent travel to the U.K. Embassies and Consulates stand ready to handle applications on an expedited basis.”]
Source: https://travel.state.gov/content/travel/en/us-visas/tourism-visit/visa-waiver-program.html