BOSTON—Brown University is warning international students and staff members not to travel outside the country after one of its professors with a work visa was deported after a trip to Lebanon.

The advisory comes as Dr. Rasha Alawieh, a kidney transplant doctor at Brown Medicine, was prevented from re-entering the country after a trip to Lebanon. Brown’s spring break begins March 22.

Brown University is advising against international travel for its campus community. The message came in a campus-wide email. The alert is going out one week before spring break for Brown students. Executive Vice President for Planning and Policy Russell Carey wrote in the email: "Potential changes in travel restrictions and travel bans,