Special prosecutor Patrick Fitzgerald said Libby told the grand jury and FBI agents that he first learned that Plame worked at the CIA from Russert, host of NBC's "Meet the Press, " during a conversation on July 10, 2003.

CNN: Ex-Cheney aide pleads not guilty

The special prosecutor, who has said she will not use a grand jury to decide whether to indict Zimmerman, has an obligation to consider all the evidence and to apply the law to the facts.

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