Though he disparaged Goldberg's reputation as a Trump critic, Waltz also said he took "full responsibility" for the journalist winding up in the chat.

Mr. Goldberg, who was included on a private text thread discussing war plans, was a longtime national security reporter who became editor of The Atlantic in 2016.

National Security Adviser Michael Waltz said that he built a group Signal chat that mistakenly included a journalist, The Atlantic’s editor in chief Jeffrey Goldberg, whose bombshell story detailed how top Trump advisers shared war plans on the texting platform.