Premiering this week at the Sundance Film Festival in Utah, the new documentary "Dirty Wars: The World is a Battlefield" follows investigative reporter Jeremy Scahill to Afghanistan, Somalia and Yemen as he chases down the hidden truths behind America’s expanding covert wars. We’re joined by Scahill and the film’s director, Rick Rowley, an independent journalist with Big Noise Films.

"We’re looking right now at a reality that President Obama has essentially extended the very policies that many of his supporters once opposed under President Bush," says Scahill, author of the bestseller "Blackwater: The Rise of the World’s Most Powerful Mercenary Army" and a forthcoming book named after his film. "One of the things that humbles both of us is that when you arrive in a village in Afghanistan and knock on someone’s door, you’re the first American they’ve seen since the Americans that kicked that door in and killed half their family," Rowley says. "We promised them that we would do everything we could to make their stories be heard in the U.S. ... Finally we’re able to keep those promises."