Update, October 5, 2019:
While nearly all of the more than 1200 memorandums for record summarizing the interviews conducted by the 9/11 Commission have been reviewed for classification, unfortunately three other key documents remain hidden — perhaps deliberately so as to avoid embarrassing officials — from the American people.
They are the 9/11 Commission’s: transcription of the ten Commissioners interviewing then President Bush and VP Cheney in the Oval Office in April 2004; 7000-word summary of a review of more than 300 related Presidential Daily Briefs to Presidents Clinton and Bush (43); and 78-page staff monograph on National Security Council work on counter-terrorism 1998 to 9/11.
Multiple FOIAs, declassification review requests, and appeals have been filed for them to no effect. We will keep trying.
— July 28, 2014 original post follows —
By January 14, 2009, only 35% of the 9/11 Commission’s staff documents had been processed by the National Archives. They are Congressional records not subject to the Freedom of Information Act. There are nearly 2,000 memorandums for record (MFRs) of the summaries and transcripts of interviews conducted by 9/11 Commissioners and staff, as well as the briefings they received.
117 MFRs are still pending declassification review. Key interviews among them illustrate the 9/11 Commissioners’ lip service last week to transparency. They briefly called for declassification on page 39 of their 49-page “update” to their original 2004 recommendations:
“The job of fully informing the American people is incomplete, however. The commission’s records, including summaries of our interviews and important intelligence and policy documents, are held by the National Archives. Some of those documents and records remain classified and are thus unavailable to the public. Authority to declassify those documents rests with the agencies that created them.”
On July 21, 2004, 9/11 Commissioners met to decide when to release this body of work. Richard Ben-Veniste asked: “Is the theory here the great cover-up of partisan differences?” The notes of the meeting do not show he received an answer. Regardless, the vote was 6 to 3 to kick the responsibility 4 1/2 years down the road. 
What motivated Samuel “Sandy” Berger in 2004 to steal classified documents from the National Archives while he acted as former President Bill Clinton’s designated representative to the 9/11 Commission? The answer may be within the 9/11 Commission interviews of Richard Clarke, George Tenet, and Sandy Berger held by the National Security Counsel. [See correction at Note 4].
Surely the Commission asked former CIA Director Tenet what efforts were made to alert the NSC and President Clinton on the movement of al Qaeda operatives immediately preceding and following the Millennium terrorist attacks plots.
On January 15, 2000, two known al Qaeda operatives, future 9/11 hijackers Nawaf al-Hazmi and Khalid al-Mihdhar, arrived in Los Angeles. During December 1999, the CIA had tracked their movements in Southeast Asia, observed their meeting with Walid bin Attash (now at Guantanamo awaiting military commission trial alongside Khalid Sheikh Mohammed), and covertly photocopied the open-ended U.S. visas within their passports. Beginning in March 2000 and before September 11, 2001, more than 50 people at the CIA knew they had entered the United States.
The 9/11 Commission staff also prepared a 78-page monograph of NSC counterterrorism efforts from 1998 to 9/11. Yet the 9/11 Commissioners have never publicly spoken of its existence which is not classified. I filed for declassification review of it in 2009.
In addition, there is the still classified (by the FBI) 9/11 Commission interview of former FBI Director Louis Freeh. Subsequent to my April 2009 request, a previously unheard of staff monograph was declassified in June 2009.  It was prepared by staffer (and former DOJ IG) Barbara Grewe on the intelligence sharing “Wall.” It concluded: “Simply put, there was no legal reason why the information could not have been shared.” Indeed. A MFR declassified and released on January 15, 2009 of 9/11 Commission staff interviews of former Deputy Attorney General Jamie Gorelick states in part:
“Gorelick said she did not know anything about how the wall was structured within the FBI. She did not believe that the FBI was required to erect a wall between intelligence and criminal agents, particularly those on the same squad and working related intelligence and criminal cases. She said she was surprised that the FBI interpreted the provisions that way.”
Strangely, the 9/11 Commissioners reminded no one that Executive Director Philip Zelikow and Commissioner Jamie Gorelick had authored a 7,000-word summary  of presidential daily briefs (PDBs). It is in former President George W. Bush’s records. It has been subject to declassification review by the NSC since January 20, 2014 as federal statute mandates a 5-year delay after a President leaves office. And there is the still classified MFR summarizing the President Bush-Vice President Cheney interview conducted by all 10 Commissioners.
Massive finger pointing as the WTC Pile, Pentagon, and a field outside of Shanksville still smoldered would have distracted key government personnel then scrambling to rally our Nation’s defense, and it would not well serve us now. Yet the American people must know the rest of the story. 2,978 names and the face of a 9/11 firefighter on a funeral mass card that I’ve long carried in my wallet haunt me; we owe it to them and future generations.
The 9/11 Commissioners can finally raise their voices and fulfill their charter to provide a “complete account of the circumstances surrounding the September 11, 2001 terrorist attacks, including preparedness.” I pray they do.
Originally posted on July 28, 2014
Note 1: Also present were “PZ” Philip Zelikow and “GC” General Counsel Daniel Marcus.
Legal Barriers to Information Sharing: The Erection of a Wall Between Intelligence and Law Enforcement Investigations
Commission on Terrorist Attacks Upon the United States
Barbara A. Grewe
Senior Counsel for Special Projects
August 20, 2004
Note 3: Zelikow confirmed its existence in a 2011 Reuters report.
Note 4: Tenet’s interview remains pending declassification review by the CIA while Clarke’s and Berger’s interviews are being held back by the NSC.