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Waltz's days appeared numbered after The Atlantic editor-in-chief Jeffrey Goldberg revealed in March that Waltz had added him to a private text chain on an encrypted messaging app that was used to discuss planning for a military operation against Houthi militants in Yemen.
Leaving a top Trump administration post? The president might have an ambassadorship for you →
"The use of Signal as an encrypted app is not only authorized; it was recommended in the Biden administration's admin system guidance," he said.
