US Defence Secretary Peter Hegseth is under intense scrutiny following the disclosure of sensitive military information regarding a Yemen airstrike during a private conversation on the Signal messaging app with his family and attorney. This latest incident comes in the wake of a previous breach involving the unauthorized sharing of classified data, leading to a probe by the Pentagon and internal upheaval within the US defence establishment. The revelations have sparked widespread concerns about the safeguarding of confidential materials and the possible violation of security procedures.