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... The hearing was the first Congressional appearance by Waltz since his controversial participation in a Signal app chat that inadvertently included a journalist while discussing a pending military operation in March against Houthi targets in Yemen.

Waltz was the Trump administration's national security adviser when the chat occurred, but no mention of the Signal chat occurred until past the hearing's first hour.

Sen. Chris -----, D-Del., raised using the Signal app to discuss classified matters, which since has been dubbed "Signalgate."

Waltz said no classified information was shared during the discussion that accidentally included The Atlantic editor-in-chief Jeffrey Goldberg.

"That engagement was driven by and recommended by the CyberSecurity Infrastructure Security Agency [and] by the Biden administration," Waltz said, as reported by ABC News. ...