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.

It is unclear how Waltz would approach the job. Trump’s first nominee, Rep. Elise Stefanik, had built a track record in ...

Waltz, who was forced out as National Security Adviser over the incident, claimed that “no classified information” was ...

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

The US Cybersecurity and Infrastructure Security Agency (CISA) has warned a popular Signal messaging app clone being used by federal agencies is under attack. The clone, TeleMessage, was found to have ...

The US security watchdog CISA has warned that malicious actors are actively exploiting two flaws in the Signal clone ...

CISA says two more vulnerabilities in the messaging application TeleMessage TM SGNL have been exploited in the wild.

Mike Waltz was removed as Trump's national security adviser and faces Senate confirmation as the new nominee to be ambassador to the U.N.

Three federal departments prohibited their employees from accessing TeleMessage — a message archiving app that former National Security Adviser Michael Waltz used while communicating with other ...

TeleMessage, the app that former national security adviser Mike Waltz was seen using, has suspended all services after hackers claimed to have stolen files from it. NBC News reporter Kevin Collier ...