The good news is that the vast majority of Syrian refugees dislike ISIS, and little wonder – many of them are victims fleeing its radical Islamic caliphate.

However, 13% is a significant level of support. Republicans have raised concerns about the ability of the Obama administration to vet Syrian refugees to make sure ISIS terrorists are not using the refugee flows to infiltrate terrorists into the country. But even if the vetting process were perfect, it does not account for the more than 1 in 10 refugees who may not be ISIS operatives, but are ISIS sympathizers – and thus potential ISIS recruits down the line.

How do you screen for that?