First, read Mansoor Ijaz on the Clinton Administration's political football playing regarding Sudan's numerous offers to turn over bin Laden to the US or at least keep tabs on him. The Sudanese also offered to watch two suspects from the Tanzania/Kenya embassy bombings who fled to Khartoum, but the US refused and Clinton bombed an aspirin factory. Is Ijaz credible? Completely -- he brokered the deal to get the Sudanese to expedite bin Laden to the US.
Next, read this essay from 2002 regarding FBI primacy in counterterrorism and its effects. Who set up the new paradigm whereby the FBI would be the primary counterterrorism agency in the US? The Clinton Administration. Who was president during the most frequent terrorist attacks against the US and its interests? Clinton.