President Donald Trump has voiced his support for National Security Adviser Mike Waltz after an incident where The Atlantic's editor-in-chief was accidentally included in a private Signal chat discussing military plans against Houthi positions in Yemen. This breach, which exposed highly classified military strategies, has raised concerns about the security of communications within the Trump administration. A congressional hearing is scheduled to investigate the incident, with testimony expected from several high-ranking intelligence and defense officials to understand the breach's implications for national security.