Las Vegas Sun - Photograph : Letterman retiring

January 17, 2018

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Former President Jimmy Carter, left, talks with David Letterman on "Late Show with David Letterman," Monday March 24, 2014. During a taping of the show Thursday, April 3, 2014, Letterman said he has informed his CBS bosses that he will step down in 2015, when his current contract expires.

CBS photo via AP

Former President Jimmy Carter, left, talks with David Letterman on "Late Show with David Letterman," Monday March 24, 2014. During a taping of the show Thursday, April 3, 2014, Letterman said he has informed his CBS bosses that he will step down in 2015, when his current contract expires.