The inspector general’s request focuses on how information about the March 15 airstrikes on Houthi targets in Yemen was shared on the messaging app.

This comes as Hegseth is scheduled to testify before Congress next week for the first time since his confirmation hearing. He is likely to face questions under oath not only about his handling of sensitive information but also the wider turmoil at the Pentagon following the departures of several senior aides and an internal investigation over information leaks.

Hegseth already has faced questions over the installation of an unsecured internet line in his office that bypassed the Pentagon’s security protocols and revelations that he shared details about the military strikes in multiple Signal chats.