The White House chief of staff position is not subject to confirmation, but it is one of Washington's most powerful positions. For his best-selling book, "The Gatekeepers: How the White House Chiefs of Staff Define Every Presidency" author Chris Whipple interviewed all 17 living chiefs. He joins "CBS This Morning: Saturday" to discuss their role, what went wrong for outgoing chief of staff Reince Priebus and why generals tend to not do very well in the position.
