I found this comment via a Google search:
Confirmation that U.S. intelligence had been successfully monitoring Al-Qaeda’s communications right through to the aftermath of 11th September came from Utah Senator Orrin Hatch, a conservative Republican with wide contacts in the national security establishment. On the day of the attacks, Hatch stated that the U.S. government had been monitoring Osama bin Laden’s communications electronically, and had thus intercepted two bin Laden aides celebrating the attacks: “They have an intercept of some information that included people associated with bin Laden who acknowledged a couple of targets were hit.”[23]
ABC News further reported that shortly before 11th September, the U.S. National Security Agency intercepted “multiple phone calls from Abu Zubaida, bin Laden’s chief of operations, to the United States.” The information contained in these intercepted phone calls has not been disclosed.[24]
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[23] Associated Press, ‘World Trade Center collapses in terrorist attack,’ 11 September 2001. In an interview with ABC News the same day, Hatch elaborated that both CIA and FBI officials had informed him of the same. In response, U.S. Defense Secretary Donald Rumsfeld denounced the report as an unauthorised release of classified information. The White House later cited the leak as good reason to withhold information concerning U.S. counterterrorist actions from Congress.
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http://www.mediamonitors.net/mosaddeq36.html
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[I remember Hatch making those comments to the live news media. I thought it was Sept 12, however. IIRC, Senator Shelby also got chastized for giving some classified info about the same time. Loose lips, etc.]