Claims of a coverup of the 9/11 attacks. That's what 60 Minutes reported Sunday night featuring former Florida Governor and U.S. Senator Bob Graham.

It's a story 10Investigates first reported two years ago and this alleged coverup has close ties to the Tampa Bay area.

Bob Graham was the chairman of the Joint Congressional Committee looking into the 9/11 attacks and had complete Top Secret clearance.

Not only is he upset that 28 pages he helped write about the origin of the attack is being withheld from you, he is also upset the FBI is withholding thousands of pages of key information from top leaders in Congress.

"I am concerned that if there was a network assisting the 19 hijackers in place in 2000 and 2001,” Graham told us in 2014, “there's no reason to believe that it was eliminated."

Former Sen. Bob Graham speaks to 10Investigates Mike Deeson.

Former Senator Bob Graham says the 28 classified pages would not only show a closer tie to the government of Saudi Arabia financing the 9/11 attack, but also would show a further connection with the hijackers and a Saudi family living in Sarasota.

Twelve days before the attack, the family with ties to the royal family abruptly abandoned the house in a gated Sarasota community leaving behind food, clothing, furnishings and three vehicles.

Twelve days before the attack, the family with ties to the royal family abruptly abandoned the house in a gated Sarasota community leaving behind food, clothing, furnishings and three vehicles.

”There are some things I can't talk about, there are others what I know is involved in the investigation in Sarasota which is diametrically opposed to what the FBI said publicly," Graham explained.

And Graham is angry the FBI told his Senate Committee investigating 9/11 the agency had turned over everything it had and there was no other documentation, but now the FBI admits the Tampa Office gathered 80,000 pages of information that it still refuses to turn over to Graham or other elected officials.

“After having said there was no documentation about the investigation in Sarasota,” Graham told us, “now 80,000 pages. Why has the federal government, including some of its most prestigious agencies, gone to such lengths to coverup what they know."

Graham says he believes if the information ever became public it would change America's perception of 9/11 and have many questioning why we give military aid and money to Saudi Arabia.

The most chilling thing he told me was this is one of the few issues that cause him to wake up in the middle of the night and lose sleep over.