Which Under Secretary of State Trafficked in Valerie Plame Wilson Info?

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Here is the current roster of senior State Department officials.
Robert Joseph now holds the portfolio previously held by John Bolton.
My hunch — given the other options at the Under Secretary level — is that John Bolton was one of Libby’s four sources on Valerie Plame Wilson. It would be nice to have confirmation.
Frederick Fleitz, Bolton’s Chief of Staff was concurrently a senior CIA WINPAC official, and may have been Bolton’s source. I’m not sure, but he may also have been the “senior CIA officer” referred to as one of the four Plame sources for Libby.
— Steve Clemons