"And that was his intention?" Pelley asks.
"Yes," Piro says.
"What weapons of mass destruction did he intend to pursue again once he had the opportunity?" Pelley asks.
"He wanted to pursue all of WMD. So he wanted to reconstitute his entire WMD program," says Piro.
"Chemical, biological, even nuclear," Pelley asks.
"Yes," Piro says.
In the summer of 2004, legal custody of Saddam transferred from the U.S. to Iraq. And Saddam had no illusions about what that meant. "Prosecution and execution," Piro says.
When he appeared in court, Piro wanted to show that Saddam had been well treated, so Piro bought him a new suit and an FBI intelligence analyst cut his hair. On Piro's last day in Baghdad, he brought two Cuban cigars to the jail and sat with Saddam in his tiny garden.
"He told me that we would see each other again, which I knew wasn't going to happen. And then he said goodbye in the traditional Arab manner. And I was a little surprised. I kind of saw him tear up," Piro remembers.
The traditional Arab manner of saying goodbye - three kisses on the cheeks - surprised Piro. "And it made me feel somewhat awkward. To be saying goodbye to Saddam Hussein in that fashion," he recalls.
More than two years later, Saddam went to the gallows. Piro says that Saddam calculated his performance - his defiance, his refusal to wear a hood, so that the last picture for history would not be those humiliating images of his capture. It was, Saddam understood, the last thing he could control.
Piro says Saddam expected to die and that it didn't bother him.
"Well, his answer was is he was 67 at the time. He had lived longer than the average Arab male lived in the Middle East. He had a wonderful life. Got to be the leader of the cradle of civilization. And in his opinion, of course, had a significant impact on that country. The region. The world. So he was not bothered by having to face death," Piro says.
"No remorse? No concern for the kinds of things that he had ordered and done?" Pelley asks.
"No. No remorse," Piro says. "No regret."
Produced By Henry Schuster