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Now Playing: World News Now: Tuesday, April 29, 2014
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Now Playing: President prepares to host his first state dinner
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Now Playing: Search for motive in Toronto van attack underway
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Now Playing: 'Start Here' podcast: All eyes on Arizona
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Now Playing: President Trump to host first state dinner
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Now Playing: President Donald Trump reacts to James Comey's memos
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Now Playing: Sean Hannity denies being represented by Michael Cohen
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Now Playing: 'American Idol' Monday: The top 14