In July, after approval from the Obama administration, Congress released a 28-page chapter of previously classified material from the final report of a joint congressional inquiry into the Sept. 11 attacks. Questions about whether the Saudi government assisted the terrorists remain unanswered. The recently released 28 pages were written in the fall of 2002 by a committee of which I was a co-chairman. The pages suggested new trails of inquiry worth following, including why a Qaeda operative had the unlisted phone number for the company that managed the Colorado estate of Prince Bandar bin Sultan, then the Saudi ambassador. Some of those questions might be answered if the government released more of the findings of the Sept. 11 commission, the citizens inquiry that followed our congressional inquest. Parallel investigations were also conducted by the F.B.I. and C.I.A. How much did they look into whether Prince Bandar or other Saudis aided the hijackers? The government also knows more today ... than when the 28 pages were classified in 2003. Much of that information remains secret but should be made public. For example, the F.B.I. for a time claimed that it had found no ties between three of the hijackers ... and a prominent Saudi family that lived in Sarasota, Fla., before Sept. 11. But in 2013, a Freedom of Information Act lawsuit brought by investigative reporters led to the release of about 30 pages from an F.B.I.-led investigation that included an agent's report asserting "many connections" between the hijackers and this family.