The Pentagon’s independent watchdog launched a probe Thursday into top officials in President Donald Trump’s administration who discussed a military strike using the commercial messaging app Signal. Signalgate has roiled the White House and Defense Secretary Pete Hegseth since news broke on March 24 that The Atlantic journalist Jeffrey Goldberg was mistakenly added to a group chat discussing an attack on Houthi terrorists in Yemen.

Classification compliance? Records retention requirements? How quaint A US Department of Defense watchdog has opened an investigation into its own Secretary of Defense, Pete Hegseth, over his use of instant-messaging app Signal to discuss government business.