“We’re looking right down the muzzle of that gun," the filmmaker said of America's future.

The filmmaker's next project is about how Ali "intersected with all of the most important issues of the second half of the 20th century."

The storied filmmaker believes the U.S. is in the midst of its fourth great crisis, following the Civil War, the Great Depression and World War II.

The “far, far left,” “far, far right” and “third- and fourth-rate academics” are all wrong about America’s most famous documentary filmmaker. Just ask him.