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Russia-linked bots and trolls use tragedy to sow confusion

As President Trump continues to lash out at the FBI’s probe into Russian meddling in the 2016 election, more details are emerging about other Russian efforts to stoke controversy in the U.S. This week, Russia-linked bots and trolls have flooded Twitter with messages about last week's school shooting in Parkland, Florida. Erin Griffith, a senior writer at WIRED, joins Hari Sreenivasan to discuss.

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