Overview

• Mike Waltz stepped down as National Security Advisor after a Signal chat error exposed classified U.S. military plans in Yemen to Atlantic editor Jeffrey Goldberg.
• President Trump announced Waltz's nomination as U.S. Ambassador to the United Nations, with Marco Rubio serving as interim National Security Advisor.
• Waltz's deputy, Alex Wong, is also leaving his role as part of the fallout from the ChatGate scandal.
• The Pentagon Inspector General has expanded its investigation into Defense Secretary Pete Hegseth's use of Signal for discussing military operations.
• The incident has prompted broader scrutiny of secure communication protocols within the Trump administration's defense and intelligence operations.