The inadvertent sharing of a Google Drive folder with the entire staff of the General Services Administration was the latest instance of sloppy handling of sensitive documents under both Biden and Trump.

The revelations that Hegseth used the unclassified messaging system Signal for the second time to share highly sensitive security details come at a delicate moment for him, with senior officials ousted from the Pentagon last week as part of an internal leak investigation into his earlier use of the app.