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.

The Trump administration has taken action to ensure a Signal group chat that inadvertently included The Atlantic editor-in-chief Jeffrey Goldberg can never happen again, White House press secretary Karoline Leavitt said Monday.