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Sen. Richard Blumenthal told Axios' Mike Allen on Friday that if Facebook CEO Mark Zuckerberg does not testify in Congress, he will face a subpoena: "My message to Mark Zuckerberg is: You are the right person. There is nobody better than you, in fact you have an obligation to testify."
The bigger picture: On Wednesday, Zuckerberg said on CNN that he would be "happy" to testify if it was "the right thing to do," and if he was the person with "the most knowledge" about what happened with Cambridge Analytica.