Watch: Facebook's Zuckerberg Testifies At The Senate On User Data

Facebook CEO Mark Zuckerberg testified on Capitol Hill to answer questions about protecting user data on Tuesday.

The hearing held by the Senate Judiciary and Commerce committees followed news that the data-mining and political consulting firm Cambridge Analytica obtained personal information of up to 87 million Facebook users. The firm is accused of using that information to target Facebook users with political advertising in 2016.

Zuckerberg is testifying for a second day Wednesday before the House Energy and Commerce Committee.