U.S. Senators Mike Enzi and John Barrasso, both R-Wyo., joined U.S. Senator Mark Kirk (R-Ill.) and others today in calling for a pause in the Syrian and Iraqi refugee programs until authorities are able to detect the use of fake passports following reports ISIS has a “fake document industry” with passport machines and blank passports.

In a letter to Secretary of State John Kerry and Secretary of Homeland Security Jeh Johnson, the senators called for new measures to ensure false documents can be detected during the screening process before any more Syrian or Iraqi refugees are admitted to the United States.

“The threat to the United States posed by ISIS-created Syrian passports is now imminent,” the senators wrote. “That danger will continue to grow so long as our enemies are able to perfect these passports and exploit loopholes in refugee programs. ISIS is an enemy that constantly adapts around our security posture, and there is no room for error when it comes to protecting our citizens from their brutal terror campaign.”

Homeland Security Intelligence Reports indicate that ISIS has access to “boxes of blank passports,” and just last week ABC News reported that the terrorist group has created an entire “industry” producing fake passports.

The letter was also signed by Senators Thom Tillis, R-N.C., Bill Cassidy, R-La., Roger Wicker, R-Miss., James Inhofe, R-Okla., and Steve Daines, R-Mont. 

The text of the letter can be seen here and is below.