'Heads are exploding': How security experts see the Signal war-plan breach

President Trump speaks alongside Secretary of Defense Pete Hegseth in the Oval Office on March 21. Days earlier, Hegseth shared details about overseas war plans in a group chat on Signal, an encrypted, open-source messaging app, according to The Atlantic.

The breach left military and intelligence experts asking the same questions as the public: Why would top U.S. officials use a free messaging app to discuss classified military plans?

(Image credit: Anna Moneymaker)