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Sen. Jeff Sessions Rep. Marsha Blackburn complained Thursday about the Office of Refugee Resettlement's failure to submit an annual refugee report to Congress, and warned that the Obama administration's general approach to the refugee matter is endangering Americans.

Sessions, R-Ala., and Blackburn, D-Tenn., sent a letter to Health and Human Services Secretary Sylvia Burwell Wednesday, demanding answers on the report that is now more than 10 months late, writing that Congress cannot write a "blank check" to the president and the refugee bureau.

"These are grave matters… Already, at least a dozen individuals admitted to the United States as refugees have been implicated in terrorism in 2015 alone," Sessions and Blackburn said Thursday.

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