US State Department Travel Restriction Memo Lists of 41 Countries Divided Into Three Separate Categories.
Full visa suspension:
Afghanistan
Cuba
Iran
Libya
North Korea
Somalia
Sudan
Syria
Venezuela
Yemen
Partial visa suspension (tourist, student and some other visas affected):
Eritrea
Haiti
Laos
Myanmar
South Sudan
Countries recommended for a partial suspension if they do not address deficiencies:
Angola
Antigua and Barbuda
Belarus
Benin
Bhutan
Burkina Faso
Cabo Verde
Cambodia
Cameroon
Chad
Democratic Republic of the Congo
Dominica
Equatorial Guinea
Gambia
Liberia
Malawi
Mauritania
Pakistan
Republic of the Congo
Saint Kitts and Nevis
Saint Lucia
Sao Tome and Principe
Sierra Leone
East Timor
Turkmenistan
Vanuatu