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From the report, page 107 (talking about terrorism being a second or third priority for Congressional committees with this jurisdiction):

“In fact, Congress had a distinct tendency to push questions of emerging national security threats off its own plate, leaving them for others to consider. Congress asked outside commissions to do the work that arguably was at the heart of its own oversight responsibilities. Beginning in 1999, the reports of these commissions made scores of recommendations to address terrorism and homeland security but drew little attention from Congress. Most of their impact came after 9/11.”