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FBI Director Robert Mueller III testifies before the Senate Judiciary Committee during a oversight hearing on Capitol Hill December 14, 2011 in Washington, DC.
FBI Director Robert Mueller III testifies before the Senate Judiciary Committee during a oversight hearing on Capitol Hill December 14, 2011 in Washington, DC.

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    When we need special counsel

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When we need special counsel

CNN's Ariane de Vogue explains what circumstances are needed in order for the Department of Justice to call on a special counsel.

When we need special counsel

CNN's Ariane de Vogue explains what circumstances are needed in order for the Department of Justice to call on a special counsel.