New York - Immigrants who were brought to the US illegally as children, but were protected from deportation by President Barrack Obama, are being warned by some advocates to make sure they are not travelling abroad when Donald Trump is sworn in as president on January 20.Some advocates, lawyers and universities are concerned that Trump might immediately rescind an Obama programme that had allowed these young immigrants to work and travel for humanitarian, educational or employment purposes.That could lead, they fear, to some people travelling abroad being barred from re-entering the US."We are recommending all travel be completed by or before January 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 US."Trump made illegal immigration the cornerstone of his campaign, promising to build a wall along the Mexican border and deport millions of people living in the country illegally.His actual plans, though, have yet to be revealed. Recently, he has said he wants to focus on people who have committed crimes.During a recent Time magazine interview, Trump expressed sympathy for the 741 000 people in Obama's Deferred Action for Childhood Arrivals programme, which started in 2012."We're going to work something out that's going to make people happy and proud," Trump said. "They got brought here at a very young age, they've worked here, they've gone to school here. Some were good students. Some have wonderful jobs. And they're in never-never land because they don't know what's going to happen."CautiousAdvocates are still being cautious.Nancy Lopez-Ramirez, a 20-year-old student born in Mexico who is planning a trip there as part of a City College of New York class, said she is glad the group is returning by January 15."My mom is like 'I am concerned with you not coming back, I want you to be able to come back,'" she said."It is nerve-wracking, but I think that at the end it is going to be worth it," said the political-science student, who was brought to the US when she was 4.City College, part of the City University of New York, is one of the institutions advising students in the DACA programme to return before Inauguration Day. So is California State University, which told administrators to tell participants in the programme "that if they are outside of the United States as of January 20 2017, there is no assurance they will be allowed to return to the US".Trump can rescind the promised protection right away through an "operational memo" because Obama implemented it through one, said William Stock, president of the American Immigration Lawyers Association.He said the programme's participants should not consider travelling overseas unless they absolutely need to.US Customs and Border Protection spokesperson Anthony Bucci said his agency "cannot speculate" when he was asked how long would it take for CBP officers to deny entry to the US to programme participants if Trump eliminated the protection.US Citizenship and Immigration Services records said that as of December 31 2015, about 22 340 people in the DACA programme were approved for the "parole" that allows them to travel outside the US.Trump called the programme an "illegal amnesty" during his campaign.Tatyana Kleyn, an associate professor at City College who organised the upcoming Mexico trip, said interest in it actually surged among students after the presidential election."So right now our bus fits 18 and we are bringing 20," she said. "It feels like a last chance."