What to know about Mueller's use of a grand jury in the Russia probe

What exactly does a federal grand jury do, and what does it mean that Mueller has started utilizing one in the nation's capital? Here's what you need to know.
1:20 | 08/04/17

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Transcript for What to know about Mueller's use of a grand jury in the Russia probe
It's. Okay. And yeah. Or. Oh yeah. Oh. Man. Yeah.

This transcript has been automatically generated and may not be 100% accurate.

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