ATLANTA -- Prosecutors played taped phone calls Friday in the trial that Brian Nichols made from the jailhouse and they carry the potential to destroy his defense.

Nichols’ attorneys are trying to paint him as someone delusional during the courthouse shootings.

The tapes played will make that defense more difficult.

It was a phone call Nichols made in March 2006 from the jailhouse to his father in which Nichols said, “A black man must be crazy. I could have told them there's nothing wrong with me. Could have saved them some time and money."

The call could damage Nichols' defense strategy. His lawyers are claiming he was delusional and insane as the courthouse erupted into gunfire.

It compounds testimony from Thursday including pages and pages of writings by Nichols, seemingly for a book about his escape, from a man who's claimed he was at war with the government.