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Mueller testimony: 3 key questions Congress should ask

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NBC News analysts former Sen. Claire McCaskill and former Acting Solicitor Gen. Neal Katyal preview Robert Mueller’s testimony ahead of his hearing. Katyal says lawmakers should focus on three questions: “No.1, Mr. Mueller, did you find no obstruction? No. 2, Mr. Mueller, did you find no collusion? No. 3, Mr. Mueller, did your report totally exonerate the president?”