Democratic House candidates should never say "all lives matter" under any circumstances, according to a highly confidential memo sent to staffers for the party's congressional campaign arm, which was leaked this week.

"This document should not be emailed or handed to anyone outside of the building," according to the November 2015 memo. "Please only give campaign staff these best practices in meetings or over the phone."

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The document, intended to advise staffers on how to deal with the Black Lives Matter movement, was released Tuesday evening as part of a trove purportedly obtained from a personal computer belonging to House Minority Leader Nancy Pelosi. The information was posted on a WordPress blog operated by Guccifer 2.0, who has released a stream sensitive documents obtained from the Democratic Congressional Campaign Committee.

"Do not say 'all lives matter' nor mention 'black on black crime,'" the instructions state. "This response will garner additional media scrutiny and only anger BLM activists. This is the worst response."

The document described BLM as a "radical movement" seeking "to be part of the conversation," but warned that BLM activists "don't want their movement co-opted by the Democrat Party."