Only on the “CBS This Morning” podcast, historian Kenneth Davis joins CBS News correspondent Vladimir Duthiers to discuss the legacy of explorer Christopher Columbus and why there's a push to rename the national holiday that bears his name. Davis, the author of "Don't Know Much About History" and "America's Hidden History" explains what Columbus' own diaries reveal about his mistreatment of the natives when he completed his voyage to the "new world" and why advocates say the holiday should be renamed Indigenous Peoples' Day.