Donald Rumsfeld
The United States was attacked on September 11, 2001 by al Qaeda terrorists who hijacked commercial airliners and crashed them in coordinated strikes into both towers of the World Trade Center in Lower Manhattan, New York City and the Pentagon in Washington, D.C. The fourth plane crashed into a field in Shanksville, Pennsylvania, and its target was likely a prominent building in Washington, D.C., most probably either the Capitol Building or the White House. Within three hours of the start of the first hijacking and two hours after American Airlines Flight 11 struck the World Trade Center, Rumsfeld raised the defense condition signaling of the United States offensive readiness to DEFCON 3, the highest it had been since the Arab-Israeli war in 1973.
Siraj Wahhaj
Wahhaj was one of 170 people identified by US Attorney Mary Jo White in 1995 as "unindicted persons who may be alleged as co-conspirators" in the 1993 World Trade Center bombing, but was never charged, and denies any involvement with the bombing. 
Wahhaj was a defence witness at the trial of the Blind Sheikh, Omar Abdel-Rahman, the former leader of the Egyptian terrorist organization, Gama'a al-Islamiyya.