Waltz, who previously served as a Florida congressman and as a decorated combat Green Beret, has come under fire from Democrats and critics since March, when the Atlantic magazine‘s editor-in-chief Jeffrey Goldberg published a firsthand account of getting added to a Signal group chat with top national security leaders, including Waltz, Secretary of Defense Pete Hegseth and CIA Director John Ratcliffe, while they discussed strikes against Yemen terrorists. Trump and his administration have repeatedly defended the national security leader amid criticisms over the chat leak.
Signal is an encrypted messaging app that operates similarly to texting or making phone calls, but with additional security measures that help ensure communications are kept private to those included in the correspondence.