State Department spokesman John Kirby acknowledged Wednesday that Islamic State terrorists are trying to mingle with refugee populations overseas in the hopes of making it to the U.S. posing as a refugee.

"I wouldn't debate the fact that there's the potential for ISIS terrorists to try to insert themselves, and we see that in some of the refugee camps in Jordan and in Turkey, where they try to insert themselves into the population," Kirby said on "Fox and Friends."

.@statedeptspox: I wouldn't debate that there's potential for ISIS terrorists to try to insert themselves into the refugee population pic.twitter.com/zlIthXPm66 — FOX & friends (@foxandfriends) September 21, 2016



Still, he argued that the vetting process for these refugees is tough, and should be enough to keep terrorists out, although he admitted it's not a perfect process.

"The vetting process, while not perfect, is a very, very stringent, and it can take almost up to two years for a single refugee to make it into the country," he said.

He said in the same interview: "Is it perfect? Can it be perfect? Can it be foolproof? Well, probably not, no."

Questions about refugee vetting have been raised again after the weekend bombings in New York and New Jersey, which police believe may have been done by a U.S. national who was born in Afghanistan.

Just days later, President Obama met with world leaders in New York to ask them to accept more refugees, even as Republicans in Congress and Donald Trump have said the U.S. needs to slow down the process of accepting people.