National Security Advisor Mike Waltz is stepping down just weeks after the explosive Signalgate controversy, in which top Trump officials were caught discussing a sensitive military operation in an unsecured group chat that mistakenly included a journalist. Senator Mark Warner called it a “holy crap on steroids” breach to MSNBC’s Rachel Maddow when the news first broke; security experts raised alarm; and after weeks of criticism, Waltz has been removed from that post, transferred to New York to be U.S. Ambassador to the United Nations. MSNBC’s Ari Melber reports on this first major senior staffing change of the administration. (The Beat’s YouTube playlist: https://msnbc.com/ari Beat merch: www.msnbc.com/Beat5)
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