The Trump administration sought to put the scandal over its use of the Signal messaging app behind it on Monday, calling it case closed, even as the breach provoked bipartisan criticism and opened up divisions inside the White House.

The White House considers the Signal chat leak case "closed," press secretary Karoline Leavitt told the media Monday.

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.

Republican calls to investigate a group chat in which White House national security officials shared sensitive military information have intensified, with Oklahoma Senator James Lankford saying an inquiry would be "entirely appropriate".

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,