Experts say while ISIS has vowed to infiltrate the refugees, there could be an even more pressing threat from the Syrians already here.

The United States has let in so many people from Syria since 2012 that counterterrorism specialists probably have no way to keep track of them all.

That report from Fox News comes during the debate over whether U.S. officials will be able to vet and properly track the 10,000 Syrian refugees President Obama has vowed to take in as civil war and ISIS savagery have caused them to flee.

Fox News reports that experts say while ISIS has vowed to infiltrate the refugees, there could be an even more pressing threat from the Syrians already here.

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