From MSNBC.

Sen. Mark Warner, D-Va., slammed White House officials whom The Atlantic’s Jeffrey Goldberg reported as having been involved in a Signal group chat discussing military plans that inadvertently included him.
Warner called the group chat mishap an example of "sloppy, careless, incompetent behavior, particularly towards classified information."
"Putting aside for a moment that classified information should never be discussed over an unclassified system, it’s also just mind-boggling to me that all these senior folks were on this line, and nobody bothered even to check," Warner said, referring to Goldberg having been included in the discussion. "Security hygiene 101: Who are all the names?"

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