When Chet Huntley retired from the anchor chair of The Huntley–Brinkley Report
in 1970, the evening news program was renamed NBC Nightly News, and David
Brinkley co-anchored the broadcast with John Chancellor and Frank McGee.The
early years of the Nightly News never matched the popularity the Huntley-Brinkley 
Report had enjoyed. The NBC network attempted to launch several news magazine  
shows with Brinkley as anchor and none of them succeeded. He soon became 
unhappy and left NBC in 1981. He was almost immediately offered a position 
at ABC where he anchored the Sunday morning TV news program, Issues 
and Answers, later titled “This Week with David Brinkley”.  

When David Brinkley left NBC