Waltz is a former Green Beret and Florida representative, who resigned from Congress to join the Trump administration. He served as national security adviser for roughly three months.

Democrats will likely zero in on Mike Waltz's involvement setting up a Signal group chat to discuss plans about strikes against the Houthis during his confirmation hearing for U.N. ambassador.

White House National Security Adviser Mike Waltz listens to a question from a reporter in the James Brady Press Briefing Room at the White House in Washington, Feb. 20, 2025.

Jan 14, 2025; Washington, DC, USA; Incoming National Security Advisor Michael Waltz (L) delivers remarks during a Senate Armed Services committee hearing on the expected nomination of Pete Hegseth ...

White House National Security Adviser Mike Waltz listens to a question from a reporter in the James Brady Press Briefing Room at the White House in Washington, Feb. 20, 2025.