Watch video clips and the latest episodes of ABC's World News Tonight with David Muir free online. Catch behind the scenes moments, full episodes and more.
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David Muir on overcoming a 'polarizing time' to be America's #1 nightly newscast | Exclusive
David Muir talks to USA TODAY about ABC's "World News Tonight" being named the most-watched evening newscast for 10 years and navigating TV changes.
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