It turns out Hegseth’s own Department of Defense issued a warning to all personnel last month advising them not to discuss anything over Signal due to security vulnerabilities within the app, according to CBS News. Various legal experts have already said that Hegseth and the other Trump officials committed a felony just by discussing the plans in the app. Now that there’s proof Hegseth knew he wasn’t supposed to do so, it takes away any reasonable doubt argument he might try to make.