NPR

Mark Zuckerberg Tells Senate: Election Security Is An 'Arms Race'

The CEO of Facebook is testifying before Congress for the first time on Tuesday. His prepared testimony includes an apology for allowing Facebook tools to be used to do harm — and a vow to change.
Facebook CEO Mark Zuckerberg testifies before a joint hearing of the U.S. Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill in Washington, D.C., on Tuesday.

Updated at 4:25 p.m. ET

Mark Zuckerberg is facing dozens of senators — and the American television audience — to take "hard questions" on how Facebook has handled user data and faced efforts to subvert democracy.

"We didn't take a broad enough view of our responsibility, and that was a big mistake. It was my mistake, and I'm sorry," the co-founder and CEO of Facebook, uncharacteristically wearing a suit, said in his opening remarks. "I started Facebook, I run it, and I'm responsible for what happens here."

Zuckerberg is testifying Tuesday before a joint session of the Senate commerce and judiciary committees.

You can watch the video live above, or click here to watch the video on ... well ... Facebook. Or C-SPAN here. We'll update this post with highlights from the proceedings.

The leaders of the committees, in their opening remarks,

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