Executive Order 13769 lowered the number of refugees to be admitted
into the United States in 2017 to 50,000, suspended the U.S. Refugee
Admissions Program (USRAP) for 120 days, suspended the entry of Syrian
refugees indefinitely, directed some cabinet secretaries to suspend entry
of those whose countries do not meet adjudication standards under U.S.
immigration law for 90 days, and included exceptions on a case-by-case
basis. Homeland Security lists these countries as Iran, Iraq, Libya,
Somalia, Sudan, Syria, and Yemen.
I recall people with valid green cards having issues getting back into the country under the original EO. Even people with (e.g.) Canadian citizenship that were born in said countries were having issues... or people born in Canada whose parents were originally from those countries.
I don't think that the distinction is as narrow as you think that it is.
From [1]:
What did I miss?[1]: https://en.wikipedia.org/wiki/Executive_Order_13769