Meet David Muir, the man ready to take over 'World News'

Updated
Meet David Muir, the Man Taking Over ABC's 'World News'
Meet David Muir, the Man Taking Over ABC's 'World News'


Diane Sawyer says goodbye to ABC World News tonight. David Muir is the man taking over. He's already moved into his office and ET is his first guest. He gives us a look at a day in his life at ABC.

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