This article is for informational and educational use only. It does not provide legal, financial, or tax advice and does not form an attorney-client relationship. Legal requirements can differ by jurisdiction and may change without notice. A qualified professional can address specific facts and current rules.
Key Facts
- Federal level: FOIA can withhold properly classified national security information under Exemption 1, but FOIA also requires release of reasonably segregable non-exempt portions.
- Federal level: EO 13526 limits original classification, including requiring a damage-related determination and prohibiting classification when there is significant doubt.
- Federal level: EO 13526 states classified information shall not be declassified automatically due to unauthorized disclosure of identical or similar information.
- Federal level: Mandatory Declassification Review (MDR) provides a route to request a federal agency review of classified information for declassification under EO 13526, subject to limitations.
- Federal level: MDR denials can be appealed to ISCAP under 32 CFR § 2003.13, including a 60-day timeliness rule.
- Federal level: When MDR and FOIA requests cover the same matter, agency processing can require an election between the two processes.
Last reviewed: May 2026. Legal rules, forms, deadlines, and procedures can change by jurisdiction, agency, and court system.
- FOIA’s role in national security transparency
- Exemption 1 and the “reasonable segregation” obligation
- Why EO 13526 classification rules matter before disclosure
- Mandatory Declassification Review (MDR) as a second transparency pathway
- MDR appeals to ISCAP and key timing rules
- FOIA vs MDR at a glance
- Common confusion points
- Sources
National security transparency generally describes the tension between public access and government secrecy for properly classified information. Under federal law, access and declassification work through two connected tracks: FOIA processing for government records and declassification mechanisms set by executive branch classification rules, including Mandatory Declassification Review (MDR).
FOIA’s role in national security transparency
FOIA is the federal statute that requires agencies to make many government records available to the public, but it also creates specific exemptions for national security matters. A key national security exception appears in 5 U.S.C. § 552, which excludes certain categories from FOIA disclosure.
Exemption 1 and the “reasonable segregation” obligation
FOIA’s Exemption 1 is designed for properly classified national defense or foreign policy information. Under 5 U.S.C. § 552, FOIA does not apply to matters “specifically authorized under criteria established by an Executive order to be kept secret” and “in fact properly classified.”
Even when Exemption 1 applies to some portions, FOIA includes a statutory segregability requirement. The same statute requires that “Any reasonably segregable portion of a record shall be provided … after deletion of the portions which are exempt.” In practice, DOJ’s FOIA guidance describes segregation as a core part of FOIA administration and frames the obligation as preventing the withholding of an entire document merely because some portions are exempt.
DOJ’s FOIA materials also clarify a common misunderstanding: Exemption 1 protects national security information that is properly classified, not information that is merely “classifiable.” See FOIA Guide Exemption 1 and DOJ’s segregation guidance in Reasonable Segregation obligation.
For background on how transparency debates often intersect with privacy questions, see technology and privacy concerns background.
Why EO 13526 classification rules matter before disclosure
FOIA exemptions and MDR both operate in a world governed by classification and declassification rules. The executive order that sets the uniform system for classified national security information includes key limits on classification and declassification.
Under Executive Order 13526, original classification is limited to circumstances where the original classification authority makes specific damage-related determinations. The order requires a determination that unauthorized disclosure “reasonably could be expected to result in damage to the national security” and that the authority can “identify or describe the damage.”
The order also limits classification by directing that if there is “significant doubt about the need to classify information, it shall not be classified.” Another provision helps resolve a frequent confusion in transparency discussions: EO 13526 states that classified information is not automatically declassified because of unauthorized disclosure of identical or similar information.
Mandatory Declassification Review (MDR) as a second transparency pathway
FOIA and declassification are not the same process, even though both can lead to public releases. MDR is a declassification pathway created under EO 13526.
On NARA’s MDR overview page, Mandatory Declassification Review (MDR) describes MDR as a means by which any individual or entity can request a federal agency to review classified information for declassification under EO 13526, subject to limitations. EO 13526 also sets limits on when MDR review applies, including requirements tied to how specifically the request identifies the records and rules related to whether litigation is pending.
MDR appeals to ISCAP and key timing rules
MDR is not always granted after initial agency review. When an agency denies an MDR request, the process can include further review through an administrative appeal path.
NARA’s MDR appeals page, MDR Appeals to ISCAP, explains that after an agency denial, a requester can pursue administrative appeal steps and that MDR denials can proceed to ISCAP.
A separate procedural rule can affect how agencies process overlapping submissions. NARA’s MDR appeals page explains an election concept: if a requester submits a request under both MDR and FOIA for the same matter, the agency requires the requestor to elect one process or the other.
The 60 day ISCAP appeal window
Timing matters for MDR appeals. 32 CFR § 2003.13 states that an appeal to ISCAP “must be filed within 60 days of” the final agency decision or the agency’s failure to meet applicable time frames.
The same regulation also addresses submission methods. It provides that ISCAP appeals “may be submitted … by email or mail” and identifies ISCAP’s email contact as ISCAP@nara.gov.
FOIA vs MDR at a glance
The federal transparency framework can feel confusing because both FOIA and MDR involve disclosure-related outcomes, but they come from different authorities and target different kinds of review.
| Feature | FOIA processing | MDR and ISCAP appeals |
|---|---|---|
| Governing authority | FOIA statute, including national security Exemption 1 and statutory segregability | EO 13526 declassification review, with MDR appeals to ISCAP under 32 CFR Part 2003 |
| National security withholding | Exemption 1 excludes properly classified national defense/foreign policy information from FOIA disclosure | MDR review depends on EO 13526 limitations (including specificity and no pending litigation) |
| What can still be released | FOIA requires release of reasonably segregable non-exempt portions | MDR focuses on declassification review for the classified information |
| Appeal-related processing | FOIA has its own processing structure under FOIA law and exemptions | MDR denials can proceed to ISCAP; appeals have a 60-day timeliness rule |
Common confusion points
- Unauthorized disclosure does not automatically end classification. EO 13526 provides that classified information shall not be declassified automatically as a result of unauthorized disclosure of identical or similar information.
- Exemption 1 is about properly classified information, not just classifiable information. DOJ’s FOIA guidance explains Exemption 1 protects properly classified national security information.
- FOIA segregability is not optional. FOIA’s segregability requirement is statutory and tied to releasing reasonably segregable non-exempt portions after deleting exempt portions.
- FOIA and MDR can require an election. NARA’s MDR appeals materials describe that when MDR and FOIA requests are submitted for the same matter, agencies require an election between processes.
National security transparency in the real world often turns on which legal track applies to the information: FOIA processing for disclosure of records, or MDR/ISCAP review for declassification of classified material. EO 13526 classification limits, FOIA’s Exemption 1 and segregation rules, and the MDR appeal timing rules together shape what gets released and when.
