Alexander Butterfield was ‘worried to death’ testifying against Nixon

Nearly 49 years ago, President Nixon’s former deputy assistant, Alexander Butterfield, testified before the Senate Watergate Committee and disclosed the existence of the White House’s taping device. The former surprise witness joins MSNBC’s Lawrence O’Donnell to discuss the testimony that led to the resignation of Richard Nixon and his reaction to Cassidy Hutchinson’s testimony to the January 6 Committee.