Donald Trump campaigned for president on a firm stance against taking in more Syrian refugees, expressing distrust in the vetting process and concern that among those admitted into the United States, there may be terrorists.
Taking it a step further, he said that if he made it to the White House, he would remove existing Syrian refugees from the country.
"I'm putting the people on notice that are coming here from Syria, as part of this mass migration, that if I win, if I win, they're going back," Trump said Sept. 30, 2015. They're going back. I'm telling you. They're going back."
WHY HE'S PROMISING IT
Despite a rigorous vetting process already in place for refugees — which can take up to two years — Trump claimed "we have no idea" who is coming in.
"There's no identification, there's no anything," Trump said during a campaign rally in New Hampshire in September 2015.
Refugees could be ISIS terrorists, Trump said at that rally.
"Because you know, military tactics are very interesting. This could be one of the great tactical ploys of all time, 200,000-man army, maybe, or if you said 50,000 or 80,000 or 100,000, we got problems. And that could be possible. I don't know that it is, but it could be possible," Trump said. "So they're going back. They're going back … And I know a lot of people are saying, 'well, that's not nice.' We can't afford to be nice. We're taking care of the whole world."
WHAT NEEDS TO HAPPEN
To fulfill his promise, Trump would need to remove about 15,000 people.
From 2012 to the end of fiscal year 2015 (Sept. 30, 2015), the United States admitted slightly more than 1,800 Syrian refugees. In fiscal year 2016, the United States accepted about 13,000 Syrian refugees.
In comparison to other countries such as Canada and Germany, the United States accepted few Syrian refugees during the first years of the Syrian civil war.
HOW MUCH WILL IT COST
Trump has not said how much it would cost to remove Syrian refugees.
Refugees are not in the country illegally. However, the cost of arresting, detaining and removing an undocumented immigrant was pegged at $12,500 in 2011 by a U.S. Customs and Immigration Enforcement official.
WHAT'S STANDING IN HIS WAY
Despite his promise, Trump's abilities to remove existing refugees are limited.
"There is no legal authority for the president to remove Syrian refugees or anyone else from the United States unless the particular individual falls within one of the specific deportation grounds prescribed by Congress," said Stephen Legomsky, professor emeritus at Washington University School of Law in St. Louis and a former chief counsel at U.S. Citizenship and Immigration Services.
An individual may be deportable on grounds of criminal misconduct, national security, public health or various immigration violations, Legomsky said.
Refugees are legally present in the United States and are required by law to apply for permanent resident status after being in the country for one year. They can apply for U.S. citizenship after being a resident for five years.
POSSIBLE TIMELINE
Removal of Syrian refugees would have to be done on a case-by-case basis, if the individual is convicted of certain criminal activity, endangers public safety or national security, or commits other violations.