Several members of the US Congress have joined calls for the release of classified pages from an intelligence report into the September 11, 2001, attacks on the US.

The politicians argue that the 28 pages of classified text refers to allegations that Saudi Arabia's officials were involved in helping to finance the attacks.

Former Florida Senator Bob Graham, who co-chaired the 2002 House-Senate Joint Inquiry, the first official investigation into 9/11, joined current congressional members on Tuesday as they publicly called for the release of the classified material.

Graham told Al Jazeera that the US public would be "outraged" if they knew the truth.

"If the American people knew the full truth, I believe there would be an outrage that a country which alleges to be such an ally of ours has engaged in so many actions that have been so extremely negative towards the United States," Graham said, referring to Saudi Arabia.

Watch Al Jazeera correspondent Kristen Saloomey's extended interview with former Senator Graham below: