He knew and he lied under oath.

Holder must have known right away because his Deputy Chief of Staff Monty Wilkinson received an email from then-Arizona U.S.
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Lewis Libby Attorney General Dennis Burke telling him just that: "The guns found in the desert near the murder(ed) BP officer connect back to the investigation we were going to talk about — they were AK-47s purchased at a Phoenix gun store."

According to the Daily Caller, the emails also showed that Wilkinson then "alerted" Holder about the killing of the U.S. agent.

Since then, Wilkinson has taken the Fifth in congressional testimony and told investigators, "I don't recall," while the Justice Department on Monday declined to give any answer to the press about what Holder knew and when he knew it.

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This is classic coverup behavior — late-night document dumps, officials taking the Fifth, "I don't recall" excuses — the likes of which we haven't seen since the Nixon and Clinton years.

Scooter Libby did nothing wrong and was convicted of a felony for lying while being investigated.

Martha Stewart wasn't even charged with insider trading and went to prison for lying. She wasn't even under oath.

President Clinton was impeached, but not convicted, for lying under oath.

How in the hell can there be justice if Holder isn't impeached.