The recording came during testimony by the last witness, Capt. David Parker, who is a computer forensics expert, a detective with the university's police department and a member of a joint terrorism task force.

Federal agents had placed microphones in Aldawsari's apartment, and say they captured him speaking out loud the night before his Feb. 23, 2011, arrest. Authorities said that Aldawsari was alone when he was recorded.

In the recording, Aldawsari is speaking as if he's someone else commenting on a terror attack carried out by himself. Aldawsari, still pretending to be someone else, says the perpetrator of the terror attack would be "smiling" and getting "maximum satisfaction" from having carried one out.

Americans deserved the attacks of Sept. 11, 2001, and must die "because you people deserve it" for causing the deaths of others, Aldawsari says in the recording.

"This is the ideology he follows," Aldawsari says on the recording, speaking about himself.