WASHINGTON—President Trump is replacing national security adviser Mike Waltz roughly a month after he put a journalist on a group text chat in which advisers discussed a sensitive military operation, according to people familiar with the matter, making him the first top official to lose his job in Trump’s second term.Waltz lost favor with the president and senior advisers after the Atlantic revealed that he added a journalist to a chat on the nongovernment messaging app Signal, a crisis that dominated headlines and became one of the first major embarrassments for the administration. Trump declined to fire Waltz immediately, but privately expressed his frustration with Waltz.

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