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Senator Jeff Flake\u2019s last-minute demand for an F.B.I. investigation into Judge Brett M. Kavanaugh has single-handedly held up the confirmation vote for the Supreme Court nominee. Here\u2019s the story behind that decision. Guest: Michael D. Shear, who covers the White House for The New York Times, and Ana Maria Archila, one of the protesters who spoke to Mr. Flake on his way to the Senate Judiciary Committee meeting on Friday. For more information on today\u2019s episode, visit nytimes.com/thedaily.