National Security DOD and State Have Processes for Formal and Informal Challenges to the Classification of Information, Report to the Honorable Christopher S. Murphy, U.S. Senate [open pdf - 2MB]
From the Document: "Classified national security information is vital to U.S. national interests. The appropriate protection and handling of this information is a top priority for the executive branch and Congress. Based on guidance, such as Executive Order 13526, 'Classified National Security Information,' authorized holders with access to classified information may submit a classification challenge if there are reasons to believe information is improperly classified. According to DOD and State officials, Members may also submit a classification challenge. GAO [Government Accountability Office] was asked to review the processes for challenging the classification of national security information. This report describes (1) the processes to challenge the classification of information at DOD and State; and (2) the processes that Members of Congress can use to challenge the classification of information at DOD and State. GAO reviewed applicable laws and regulations, and DOD, State, and other guidance related to the classification of information and classification challenge processes. GAO also interviewed DOD, State and ISOO [Information Security Oversight Office] officials."
Government Accountability Office: https://www.gao.gov/