The Chronicle of Higher Education:
Colleges Scramble After Trump’s Executive Order Bans Citizens of 7 Muslim Countries
The main message was one many institutions had been spreading well before Friday: Students and scholars, if you might be affected by such an executive order, don’t leave the country...
...An official with the Association of Public and Land-Grant Universities told The New York Times that the association knew of an undergraduate student in Iran who had been stopped from boarding a flight to the United States. It is estimated that more than 15,000 international students could be affected by the ban, roughly 12,000 from Iran alone....
...Chapman University on Friday sent an email to the campus urging people outside the United States who might be affected by the order to return “as soon as possible.” (According to the Times, people seeking to enter the United States on Friday night were already being stopped at airports, including refugees who were in the air when the order was signed.)***
A copy of the email sent out by Chapman University to its community: Note the use of the phrase "could become indefinite."
This article from Pro Publica offers more insight:
Trump Executive Order Could Block 500,000 Legal U.S. Residents From Returning to America From Trips
The order bans the “entry” of foreigners from those countries and specifically exempts from the ban those who hold certain diplomatic visas.
Not included in the exemption, however, are those who hold long-term temporary visas — such as students or employees — who have the right to live in the United States for years at a time, as well as to travel abroad and back as they please....
...Citizens of Iran and Iraq far outnumber those from the other five countries among green card and visa holders. In the past 10 years, Iranian and Iraqi citizens have received over 250,000 green cards.
Iran also has the 11th most students in the U.S. among foreign nations, according to the Institute of International Education’s Open Doors report, which tracks the demographics of international students.
“We are inundated with calls and questions of how this is going to affect people,” said Jamal Abdi, policy director for the National Iranian American Council, an organization that advocates for better relations between Iranian and American people.*