When Donald Trump selected Mike Waltz to serve as national security adviser, the choice was widely seen as win-win: A combat veteran with four Bronze Stars would bring his judgment to the White House and his deep-red Florida House district was safe in Republican hands.

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.

ABC News’ Chief Global Affairs Correspondent Martha Raddatz reports on how a Signal chat discussing plans to bomb the Houthis in Yemen inadvertently included a reporter.

National security advisor Mike Waltz has taken responsibility for adding Goldberg to the infamous Signal chat, and screenshots published by The Atlantic clearly show that he was the one to do it. However,