Iowa Gov. Terry Branstad, one of 25 Republicans raising such objections, originally said yesterday, "I don't know that the states have the authority to decide whether or not we can take refugees."

Later in the day, Branstad put out a statement saying, "Until a thorough and thoughtful review is conducted by the intelligence community and the safety of Iowans can be assured, the federal government should not resettle any Syrian refugees in Iowa."

As we've reported, the Obama administration has pledged to bring in 10,000 refugees over the next year. So far, fewer than 2,000 have come in. The numbers remain relatively low because of the arduous security screening process that's in place, with coordination among federal law enforcement and intelligence agencies.

Administration officials say those procedures involve a review of all known biographical and biometric data. For Syrian refugees, there is a special layer of screening that includes in-person interviews with specially-trained staff to elicit testimony credibly. On average, it takes a Syrian refugee 18-24 months to gain admittance into the U.S.

Advocates for refugees have sharply criticized the governors' statements. Alison Parker of Human Rights Watch said, "The governors' announcements amount to fear-mongering attempts to block Syrians from joining the generous religious groups and communities who step forward to welcome them."

Presidential candidates have also weighed in, with Florida Sen. Marco Rubio telling ABC News on Sunday, "There is no background-check system in the world that allows us to find that out, because who do you call in Syria to background-check them?"

There are two Republican governors who are not asking for a pause on resettlements.

Utah's Republican Gov. Gary Herbert released a statement through his spokesman to the Salt Lake Tribune: "Utahns are well known for our compassion for those who are fleeing the violence in their homeland, and we will work to do all we can to ease their suffering without compromising public safety."

South Dakota's Republican Gov. Dennis Daugaard's chief of staff told the Argus Leader newspaper, "South Dakota has not received any Syrian refugees, and we do not believe we are going to."

Several Democratic governors affirmed that their states remain open to refugees from Syria, including those of Connecticut, Pennsylvania, Colorado, Washington and Hawaii.

A spokesman for Connecticut Gov. Dan Malloy, a Democrat, told the Hartford Courant, "We are continuing to work with and await guidance from the appropriate federal agencies on screening measures that will be taken. With that said, if refugees — many who are children fleeing a horrific, war-torn country — seek and are granted asylum after a rigorous security process, we should and will welcome them in Connecticut."

So on both sides of the aisle, there are calls for further explanation from federal officials about how the screening process works. And from the states, this debate will quickly move to Congress, where House Speaker Paul Ryan, R-Wisc., called for a pause on Syrian refugees and Republican lawmakers put together a task force on the issue.

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