Investigators for the 9/11 commission would later describe the scene in Saudi Arabia as chilling.

They took seats in front of a former Saudi diplomat who, many on the commission’s staff believed, had been a ringleader of a Saudi government spy network inside the US that gave support to at least two of the 9/11 hijackers in California in the year before the 2001 attacks.

At first, the witness, 32-year-old Fahad al-Thumairy, dressed in traditional white robes and headdress, answered the questions calmly, his hands folded in front of him. But when the interrogation became confrontational, he began to squirm, literally, pushing himself back and forth in the chair, folding and unfolding his arms, as he was pressed about his ties to two Saudi hijackers who had lived in southern California before 9/11.

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The Obama administration may soon release 28 classified pages from a congressional investigation that allegedly links Saudis in the United States to the 9/11 attackers. A former Republican member of the 9/11 Commission alleged Thursday that there was “clear evidence” of support for the hijackers from Saudi officials.

But in Florida, a federal judge is weighing whether to declassify portions of some 80,000 classified pages that could reveal far more about the hijackers’ Saudis connections and their activities in the weeks preceding the worst attack on U.S. soil.

President Obama is due to visit Saudi Arabia in 10 days. His visit comes at a time of deep suspicion between the two allies. The United States also doubts the commitment of the Saudis to fight violent Islamic extremism.

Following is a summary from CBS’ 60 minutes report on “28 pages” that holds clue to the Saudi connection and an interview with Bob Graham, who at the time was chairman of the Senate Select Committee on Intelligence and co-chair of the bipartisan joint congressional inquiry into intelligence failures surrounding the attacks.

Bin Laden Determined to Strike in U.S.” The CIA’s famous Presidential Daily Brief, presented to George W. Bush on August 6, 2001, has always been Exhibit A in the case that his administration shrugged off warnings of an Al Qaeda attack. But months earlier, starting in the spring of 2001, the CIA repeatedly and urgently began to warn the White House that an attack was coming.

By May of 2001, says Cofer Black, then chief of the CIA’s counterterrorism center, “it was very evident that we were going to be struck, we were gonna be struck hard and lots of Americans were going to die.” “There were real plots being manifested,” Cofer’s former boss, George Tenet, told me in his first interview in eight years. “The world felt like it was on the edge of eruption. In this time period of June and July, the threat continues to rise.