Diane Sawyer Introduces Incoming 'World News Tonight' Anchor David Muir in Promo

In a new promo for ABC News “World News Tonight,” former anchor Diane Sawyer introduces incoming anchor David Muir and highlights his reporting for the network, from the revolution in Egypt, earthquake in Haiti, and tsunami in Japan to Tehran, Iran and Mogadishu, Somalia.

Muir picks up where Sawyer left off at ABC News’ “World News Tonight” on Tuesday, September 2, at 6:30pm.

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