US leaked war plan: NSA Waltz explains how Goldberg was added to meeting

The US national security advisor, Mike Waltz, has claimed full responsibility for the leaked security meeting information.
He insisted that he does not know and has never texted with Atlantic journalist, Jeffrey Goldberg.
Goldberg, a well-connected Atlantic editor, was added to his Waltz’s Signal group chat to discuss strikes on Yemen.
We’re going to get to the bottom of it,” Waltz told Fox News on Tuesday.
“I just talked to Elon on the way here,” Waltz added, referring to the president’s most senior adviser, Elon Musk. “We’ve got the best technical minds looking at how this happened.”
Speaking further, the security chief offered a much simpler explanation.
Have you ever had somebody’s contact, that shows their name, and then you have somebody else’s number there?” He asked.
Waltz said that he had intended to add someone else to the caht, and thought that he had done so, but mistakenly had Goldberg’s number under that other person’s name in his phone contacts.
However, despite admitting having Goldberg’s contact on his phone, Waltz insisted he does not know the journalist.
I don’t text him, he wasn’t on my phone and we’re going to figure out how this happened,” Waltz assured Ingraham.
Waltz said that no one on his staff was to blame, adding, “Well, look, a staffer wasn’t responsible, and I take full responsibility, I built the group.”