U.S. National Security Advisor Mike Waltz, who started the now-infamous group chat coordinating a U.S. attack against the Yemen-based Houthis on March 15, is seemingly now suggesting that the secure messaging service Signal has security vulnerabilities.

Three officials told NBC News that Secretary of Defense Pete Hegseth shared information with his wife and brother that came from a top general's secure messages. Hegseth has denied sharing classified information on Signal.