Unlike the chat through which The Atlantic was mistakenly included, the newly revealed one was created by Mr. Hegseth. It included his spouse and a couple of dozen different individuals from his private {and professional} internal circle in January, earlier than his affirmation as protection secretary, and was named “Defense | Team Huddle,” the individuals accustomed to the chat mentioned. He used his personal cellphone, relatively than his authorities one, to entry the Signal chat.