What to know about Signal, the app used by Trump officials to text war plans

An encrypted messaging app called Signal is drawing attention and questions after top Trump officials — including Defense Secretary Pete Hegseth and Vice President JD Vance — allegedly used the service to discuss a highly sensitive military operation while inadvertently including The Atlantic's editor-in-chief, Jeffrey Goldberg, in the chat.

On Monday, Goldberg published a piece in The Atlantic about how he was added to an 18-person chat on Signal earlier this month to discuss military strikes in Yemen, writing that at first he "didn't think it could be real." 

The National Security Council said the messages seem to be "authentic," in a statement to CBS News after the story was published.