Waltz was removed from his job as national security adviser after he accidentally added a journalist to his Signal chat about an attack on Houthis.

Former national security adviser Mike Waltz defended his use of the encrypted Signal app during a Senate confirmation hearings Tuesday on his nomination as President Trump's ambassador to the U.N.

Waltz was removed as national security adviser in May — replaced by Secretary of State Marco Rubio — and nominated for the U.N. role.

Waltz was removed from his job as national security adviser after he accidentally added a journalist to his Signal chat about an attack on Houthis.

Waltz was removed from his job as national security adviser after he accidentally added a journalist to his Signal chat about an attack on Houthis.