Last week, the White House said the National Security Council, the White House counsel office and President Trump adviser Elon Musk were all looking into the mishap. But now, that probe has wrapped

The White House said Monday it has concluded its review into how a journalist was added to a Signal message group chat, as high-ranking officials discussed military strikes in Yemen, calling the case "closed.

An article in The Atlantic said the chat included “operational details of forthcoming strikes on Yemen, including information about targets, weapons the U.S. would be deploying, and attack sequencing.