Senate Judiciary Committee chairman Charles Grassley and the committee’s ranking Democrat, Dianne Feinstein, want to interview two high-ranking FBI officials about some key aspects of the bureau’s role in the Trump-Russia investigation — the Trump dossier, the firing of James Comey, and more. But the FBI doesn’t want those officials to talk — even though the Judiciary Committee has oversight responsibility for the FBI, and even though the request is bipartisan, and even though there appears to be no conflict with the ongoing Trump-Russia investigation conducted by special prosecutor Robert Mueller.