Did Nixon try to cover up My Lai?

...The documents, mostly hand-written notes from Nixon's meetings with his chief of staff H.R. "Bob" Haldeman, lead some historians to conclude that President Richard Nixon was behind the attempt to sabotage the My Lai court-martial trials and cover up what was becoming a public-relations disaster for his administration.

One document, scribbled by Haldeman during his Dec. 1, 1969, meeting with Nixon, reads like a threatening to-do list under the headline "Task force - My Lai." Haldeman wrote "dirty tricks" (with the clarification that those tricks be "not too high a level") and "discredit one witness," in order to "keep working on the problem."

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