The rivalry between the two men dates back to 2014 when Muir replaced Diane Sawyer on what was then known as ABC World News.

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David Muir took his spot on ABC World News and ran with it. He is the successor of Diane Sawyer, who built a massive net worth in the spot prior. David Muir has a remarkable net worth of his own ...

Syracuse native David Muir is facing criticism online over a small detail that some TV viewers noticed while he was covering ...

It took years for Katie Couric and Diane Sawyer to land spots leading the prime-time news hours on “CBS Evening News” and “ABC World News,” respectively, and both spent their tenures ...

The Marvel actor tells Diane Sawyer that he "was awake through every moment." Columbine shooter's mother talks exclusively to ABC Columbine shooter's mother talks exclusively to ABC Columbine ...