Filmmaker Ken Burns tells NPR's Michel Martin about the role that federal funding has played in his documentary work and the potential impact of the loss of that funding on children's programming.

Famed documentarian Ken Burns visited Portland this week to show excerpts from the upcoming documentary series, "The American Revolution."

Congress is moving toward revoking a billion dollars in already approved funding for the Corporation for Public Broadcasting, the entity that steers funds to public media stations. William Brangham discussed the potential impact on PBS with one of the network's most acclaimed filmmakers,