The FBI has refused to declassify 37 pages of materials related to the Uranium One deal, citing national security and the privacy issues, reports The Hill's John Solomon. The documents are thought to contain information regarding then-Secretary of State Hillary Clinton's involvement, as well as the Obama administration's knowledge of the controversial deal. 

The existence of the documents became known after a recent Freedom of Information Act (FOIA) release of related material contained an entry entitled "Uranium One Transaction." The publicly available portion includes benign material, such as public letters from members of Congress who demanded information on the Uranium One approval.