Sen. Mark Warner (D-Va.), vice chair of the Senate Intelligence Committee, calls for Defense Secretary Pete Hegseth and National Security Adviser Mike Waltz to be fired or resign after attack plans were shared in a Signal chat which inadvertently included a journalist from The Atlantic. Former CIA Director John Brennan weighs in on the apparent breach of protocol by the White House national security team. NBC News Correspondents Andrea Mitchell, Kelly O’Donnell and Courtney Kube report on the
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