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The situation grew tense and occasionally violent as protesters, many with angry and vulgar signs, clashed with Donald Trump supporters outside of the Republican candidate's rally in Pittsburgh

The situation grew tense and occasionally violent as protesters, many with angry and vulgar signs, clashed with Donald Trump supporters outside of the Republican candidate's rally in Pittsburgh. Several of the protesters have been arrested. CBS News digital journalist Jackie Alemany joins CBSN from the scene with more.

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Zuckerberg also blasted what he called “fearful voices” who want to limit trade and build walls

At Facebook's F8 developer's conference, CEO Mark Zuckerberg blasted what he called “fearful voices” who want to limit trade and build walls -- a barely-veiled attack on GOP presidential candidate Donald Trump. He also unveiled the company's ambitious roadmap for the next decade with goals of developing artificial intelligence, advancing virtual reality and increasing connectivity through drone-delivered Internet service. John Blackstone reports.

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In an interview with "CBS Evening News" anchor Scott Pelley, Ohio Gov. John Kasich reacted to Paul Ryan's announcement that he does not want to be the party nominee, and discusses the possibility of the Republican party uniting behind Trump or Cruz

In an interview with "CBS Evening News" anchor Scott Pelley, Ohio Gov. John Kasich reacted to Paul Ryan's announcement that he does not want to be the party nominee, and discusses the possibility of the Republican party uniting behind Donald Trump or Ted Cruz.

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Despite having the most delegates in his party, Republican front-runner Donald Trump is criticizing the presidential nomination process for its delegate system

Despite having the most delegates in his party, Republican front-runner Donald Trump is criticizing the presidential nomination process for its delegate system. He has called the system "crooked", and one of his aides referred to rival Ted Cruz's tactics as Gestapo-like. With analysis, CBS' Major Garrett joins CBSN from Washington, DC.

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