Islamic State terrorists have tried to pose as refugees in order to gain admittance to the U.S., Department of State spokesman John Kirby admitted Wednesday.

“I wouldn’t debate the fact that there’s the potential for ISIS terrorists to try to insert themselves,” Kirby said on Fox News. “And we’ve seen that in some of the refugee camps in Jordan and in Turkey, where they try to insert themselves into the population.”

He was defending President Barack Obama’s plan to bring in 110,000 new refugees in the next year, a huge increase from the 70,000 the U.S. typically admits, saying the vetting process is “good.”

Republican presidential nominee Donald Trump is calling for a complete moratorium on immigration from countries compromised by terror, on the grounds that it’s impossible to weed out every terrorist or would-be terrorist from the incoming refugee population. Republicans in Congress have also taken issue with the vetting program, saying it’s impossible to obtain the information necessary to properly vet them.

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