President Joe Biden is ordering the widespread declassification of information collected during the U.S. investigation of the Sept. 11 terrorist attacks following growing pressure to do so from family members of the victims. The order lays out specific timelines over the next six months for the release of the documents, with some set to be released as early as next week's 20th anniversary of the terror attacks. Information should only remain classified if its release would pose a clear national security risk, and shouldn't remain classified "in order to conceal violations of law, inefficiency, or administrative error or to prevent embarrassment to a person, organization, or agency." "Information collected and generated in the United States Government's investigation of the 9/11 terrorist attacks should now be disclosed, except when the strongest possible reasons counsel otherwise," Biden said in an executive order directing the declassification. The White House has been under intense pressure ahead of the 20th anniversary from families of victims and first responders who believe the classified documents may show a link between Saudi Arabian leaders and the attacks. Nearly 1,800 people affected by the attacks issued a statement last month opposing Biden's participation in any memorial events this year unless he released more documents. Three previous presidents had declined to declassify the documents with the Trump administration invoking the state secrets privilege in 2019 to justify keeping documents classified.