The 9/11 Commission will investigate the claim. Commission co-chairman Lee Hamilton said that Weldon's information warrants a review. Hamilton says the commission "did not learn of any U.S. government knowledge prior to 9/11 of surveillance of Mohammed Atta or of his cell."
Weldon, vice chairman of the House Armed Services and Homeland Security committees, said the hijackers were identified in 1999 by a classified military intelligence unit known as "Able Danger," which determined they could be members of an al Qaeda cell.
Weldon said that in September 2000 the unit recommended that its information on the hijackers be given to the FBI "so they could bring that cell in and take out the terrorists," Weldon said in an interview.
However, Weldon said Defense Department lawyers rejected the recommendation because they said Atta and the others were in the country legally.
"In fact, I'll tell you how stupid it was, they put stickies on the faces of Mohammed Atta on the chart that the military intelligence unit had completed and they said you can't talk to Atta because he's here" legally, Weldon said.
CBS News Correspondent Wyatt Andrews reports that Weldon says he got the story from three agents in the Able Danger unit, one of whom confirmed this to CBS News.
Weldon did not provide details on how the intelligence officials first identified the future hijackers and determined they might be part of a cell.
The congressman, considered something of a maverick on Capitol Hill, initially made his allegations in a floor speech in June that garnered little attention. His talk came at the end of a legislative day during a period described under House rules as "special orders" — a time slot for lawmakers to get up and speak on issues of their choosing.