Homeland Security Chairman Sen. Joe Lieberman told Fox News' Chris Wallace that he wants the Department of Defense to launch an investigation into the shooting rampage at Ft. Hood. Lieberman said evidence indicates that Major Nidal Malik Hasan was probably a "self-radicalized, homegrown terrorist."

"If the reports that we're receiving of various statements he made, acts he took, are valid, he had turned to Islamist extremism, and, therefore, if that is true, the murder of these 13 people was a terrorist act and, in fact,it was the most destructive terrorist act to be committed on american soil since 9/11," Lieberman said Sunday.

Lieberman wants the Department of Defense to conduct a special investigation to see if the shootings could have been predicted. "While the Army and the FBI are conducting the criminal investigation about exactly what happened and what Dr. Hasan should be charged with, the U.S. Army, the Department of Defense has a real obligation to convene an independent investigation to go back and look at whether warning signs were missed, both the stress he was under, but also the statements that he was making which really could lead people to believe that Dr. Hasan had become an Islamist extremist," said Lieberman.

"A couple of years ago, after a two-year investigation, my committee put out a report that said the new face of terrorism in America would not just be the attacks as 9/11 organized abroad and sending people in here, it would be people within this country, homegrown terrorists, self-radicalized, often over the internet, going to jihadist websites, and there's concern from what we know now about Hasan that, in fact, that's exactly what he was, a self-radicalized home grown terrorist," Lieberman concluded.