Democratic leaders of key House committees are reigniting calling for National Security Advisor Mike Waltz to step down.

Learn more about Signal, including whether the news about its use in a military intelligence breach impacts its effectiveness ...

President Donald Trump has moved to fire several senior White House National Security Council officials soon after he was ...

Secure messaging app Signal has been in the spotlight this week for national-security reasons, but companies can also learn lessons from the Trump administration’s misstep.

The so-called vulnerabilities mentioned regarding Signal are not with the app or its security. Instead, the issues are related to what is always the weakest link with any digital communications ...

This follows Monday’s reports that a magazine journalist was added to a group chat of national security officials talking about war plans. ‘Signal,’ the app used for the group chat ...

Defenese Secretary Pete Hegseth, national security adviser Mike Waltz and more of the contacts who appeared in the Signal ...

The news of Trump officials using Signal for a group chat on military ... president or the secretary of# defense or the national security adviser,## that their phones are targeted by# some of ...

The team of President Donald Trump's national security adviser, Mike Waltz, set up at least 20 group chats on the commercial ...

Did Defense Secretary Pete Hegseth’s messages detailing planned U.S. airstrikes in Yemen constitute a classified war plan?

It’s a more extensive use of the app than previously reported and sheds new light on how commonly the Trump administration’s national security team relies on Signal.

Four sources tell Politico they were aware of at least 20 chat groups, all four confirmed sensitive information was discussed ...