Former national security adviser Mike Waltz defended his use of the messaging app Signal during a confirmation hearing Tuesday during which lawmakers largely avoided the topic.

Mike Waltz, the former national security adviser who left his position in May in the wake of the Signal chat controversy in March, is facing a confirmation hearing Tuesday on Capitol Hill for his nomination as United Nations ambassador.

Michael Waltz, the former national security adviser, doubled down on the Trump administration’s defense of a Signal group chat where senior officials discussed war plans.