Mark Zuckerberg's Former Mentor: I Tried to Raise Alarm Over Russian Interference But Was Ignored

Facebook CEO Mark Zuckerberg testifies on Capitol Hill Wednesday, where he is expected to face questioning about the company's cryptocurrency Libra, among other issues. Zuckerberg has faced scrutiny before, including for Facebook's role in the 2016 U.S. presidential election. A former mentor of Zuckerberg and longtime Silicon Valley investor Roger McNamee speaks out about the company's dismissal of Russian interference in the election. "They treated it like a PR problem, not a business issue," McNamee says.