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WASHINGTON, DC - APRIL 09:  Facebook co-founder, Chairman and CEO Mark Zuckerberg arrives to testify before a combined Senate Judiciary and Commerce committee hearing in the Hart Senate Office Building on Capitol Hill April 10, 2018 in Washington, DC. Zuckerberg, 33, was called to testify after it was reported that 87 million Facebook users had their personal information harvested by Cambridge Analytica, a British political consulting firm linked to the Trump campaign.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - APRIL 09:  Facebook co-founder, Chairman and CEO Mark Zuckerberg arrives to testify before a combined Senate Judiciary and Commerce committee hearing in the Hart Senate Office Building on Capitol Hill April 10, 2018 in Washington, DC. Zuckerberg, 33, was called to testify after it was reported that 87 million Facebook users had their personal information harvested by Cambridge Analytica, a British political consulting firm linked to the Trump campaign.  (Photo by Alex Wong/Getty Images)

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Zuckerberg reveals Facebook is working with Mueller probe

The Facebook CEO reveals his company is working with Mueller probe. CNN's Laurie Segall reports.

Zuckerberg reveals Facebook is working with Mueller probe

The Facebook CEO reveals his company is working with Mueller probe. CNN's Laurie Segall reports.