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FILE - This May 15, 2013 file photo shows Chris O' Donnell, left, and LL Cool J attending the CBS Upfront in New York. The pair will co-host the Academy of Country Music's annual television special "ACM Presents: An All-Star Salute to the Troops" that will air on May 20 on CBS. (Photo by Charles Sykes/Invision/AP, File)

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In this photo provided by CBS, former President Jimmy Carter, left, talks with David Letterman on "Late Show with David Letterman," Monday March 24, 2014. Carter said during the broadcast that the Crimean annexation was "inevitable" because Russia considers it to be part of their country and so many Crimeans consider themselves Russian. But he says Russian President Vladimir Putin shouldn't be permitted to go any further. (AP Photo/CBS, Jeffrey R. Staab)

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Former CBS investigative reporter Sharyl Attkisson (CBS via Associated Press) **FILE**

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Investigative correspondent Sharyl Attkisson is seen here Jan. 13, 2012, in New York during a broadcast of "CBS This Morning." (Associated Press/CBS, John P. Filo)

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This undated photo provided by CBS shows CBS News veteran, Bill Whitaker. Whitaker is joining the cast of the network’s “60 Minutes.” CBS said Thursday, March 6, 2014, that Whitaker, a Los Angeles-based newsman who has been with CBS since 1984, will move to New York and begin on the Sunday night show next fall. (AP Photo/CBS, Michael Yarish)

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This photo provided by CBS shows CBS News veteran, Bill Whitaker. Jeff Fager, executive producer of "60 Minutes" and chairman of CBS News, announced Thursday, March 6, 2014, that Whitaker has been named a "60 Minutes" correspondent. (AP Photo/CBS, Michael Yarish)