Some advocates, lawyers and universities are concerned that Trump might immediately rescind an Obama program that had allowed these young immigrants to work and travel for humanitarian, educational or employment purposes.

That could lead, they fear, to some people traveling abroad being barred from re-entering the U.S.

“We are recommending all travel be completed by or before Jan. 20 in the event laws or procedures experience a drastic change,” said Angelica Salas, executive director of the Coalition for Humane Immigrant Rights of Los Angeles. “We wouldn’t want to expose them to an uncertain situation should they not be allowed back to the U.S.”