The government has placed a ban on all travel to the US for LIISSSY (Libya, Iraq, Iran, Somalia, Sudan, Syria, Yemen) nationals. Exceptions are for diplomats and those in C-2 status.
Refugees: The Refugee Admission Program will be suspended for 120 days and reviewed; those with pending applications may be admitted after the 120-day revision process. After 120 days only nationals of countries where it was “determined that such additional procedures are adequate to ensure the security and welfare of the United States” will be admitted.
Legal Permanent Residents: DHS has been given discretion to admit LPRs from LIISSSY (Libya, Iraq, Iran, Somalia, Sudan, Syria, Yemen) on a case-by-case basis. In this case you should contact an immigration attorney for advice before you seek entry. DO NOT sign form I-407, as you will be voluntarily giving up your LPR status.
Nonimmigrants: Visa issuance suspended for 90 days. During this time “ The Secretary of Homeland Security, in consultation with the Secretary of State and the Director of National Intelligence, shall immediately conduct a review to determine the information needed from any country to adjudicate any visa, admission, or other benefit under the INA (adjudications) in order to determine that the individual seeking the benefit is who the individual claims to be and is not a security or public-safety threat.” Nonimmigrants will be allowed to withdraw their application for admission. Expedited removal will generally only be used for those individuals who do not wish to withdraw their application for admission.