Harriet Miers Knew of Destruction of Interrogation Tapes

This shows foreknowledge that the destruction of the tape was an illegal act:

ABC News has learned that at least one White House official knew about the CIA's planned destruction of videotapes in 2005 that documented the interrogation of two al Qaeda operatives: then-White House counsel Harriet Miers.

Three officials told ABC News Miers urged the CIA not to destroy the tapes.
Another impeachable act if it turns out Bush administration officials knew about the tape:
Congress is now demanding to know why the CIA destroyed those tapes, just as its interrogation methods were facing intense public scrutiny. To some prominent members of Congress there's only one explanation: a cover up.

Democratic Senate leaders compared the CIA's actions to the Watergate scandal.