On March 6, 2017 President Trump issued an Executive Order entitled Protecting the Nation From Foreign Terrorist Entry Into the United States scheduled to take effect on March 16, 2017. This Executive Order replaces and revokes the prior Executive Order 13769 which had been issued on January 27, 2017. As with the prior Executive Order, this new Executive Order contains provisions that directly affect our student and scholar populations, along with the departments who host them. It contains provisions that seriously impact the entry into the United States of individuals without valid visas from particular countries of origin (Libya, Iran, Somalia, Sudan, Syria, and Yemen). Additionally, effects of the Executive Order's increased screening procedures will likely have an impact on travel for many non-immigrant visa holders.
The order issued on March 6th does exclude from the suspension several categories of foreign nationals including United States permanent residents, those with dual nationality traveling with a passport from a non-designated country, those who held valid visas on January 27, 2017, and those who hold valid visas on the date of implementation of the new order, March 16, 2017. In addition, the new Executive Order does not include Iraq in the list of designated countries.
The Department of Homeland Security website includes a Frequently Asked Questions page regarding the Executive Order.
Also see BIO's summary of the March 6, 2017 Executive Order.