On September 24, 2017, the Trump administration announced details of a revised and expanded travel ban upon nationals from Chad, Iran, Libya, North Korea, Somalia, Syria, Venezuela, and Yemen. The ban immediately impacts nationals of Iran, Libya, Somalia, Syria, and Yemen with no bona fide relationship to a U.S. person or entity, and will take effect for all other impacted nationals of those countries, as well as nationals of Chad, North Korea, and Venezuela, on October 18, 2017.
The original travel ban has been the subject of numerous legal challenges which blocked implementation of the ban until June, when the U.S. Supreme Court permitted a more narrowly focused version of the ban to go into effect until the Court could ultimately rule on its constitutionality, with oral arguments scheduled for October 10, 2017.
In contrast to the original ban, which temporarily suspended travel to the U.S. by nationals of the designated countries for a period of ninety days, the new ban applies indefinitely. The new rules do not apply to legal permanent residents, nor do they apply to current nonimmigrant visa holders already in the U.S. This means that students from the banned countries may remain and finish their studies, and business employees may stay for as long as their present visas are valid. Once their existing visas expire however, they will be subject to the travel ban.