In a recent incident, US National Security Adviser Mike Waltz mistakenly added journalist Jeffrey Goldberg to a private Signal group discussing potential military strikes in Yemen due to a phone contact error. The error was caused by an auto-save feature on Waltz's iPhone, leading to a White House investigation. Despite no classified information being leaked, the situation caused frustration for President Trump. However, Waltz was not fired as a result of the error. This incident highlights the importance of maintaining secure communication channels in matters of national security.