Documentary filmmaker Ken Burns, who rose to prominence with his celebrated 1990 PBS miniseries about the Civil War, has weighed in on White House Chief of Staff John Kelly's controversial comments about the historic conflict. Kelly drew fierce criticism after saying in a Fox News interview Monday night (October 30th) that a, quote, "lack of an ability to compromise " led to the Civil War, as well as calling Confederate General Robert E. Lee "an honorable man" who "gave up his country to fight for his state," and stating that, "quote, "men and women of good faith on both sides made their stand where their conscience had to make their stand." White House Press SecretarySarah Huckabee Sanders defended Kelly's comments Tuesday, and cited historican Shelby Foote as saying in Burns' documentary that a failure to compromise was a cause of the Civil War. Burns sent out two tweets yesterday about the matter, one saying, "Many factors contributed to the Civil War. One caused it: slavery," and another that referenced the end of his documentary, tweeting: "Historian Barbara Fields ended the film: 'the Civil War is still going on. It's still to be fought and regrettably it can still be lost.'"