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

Many are raising questions about how highly sensitive information is being handled by national security officials. This ...

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

Less than two weeks ago there was SignalGate, the Trump administration’s national security scandal that potentially ...

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

Mistake.” “Glitch.” “Entirely permissible.” “Hoax.” See the varied and shifting responses President Donald Trump and his ...

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

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.

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

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

The White House concludes its review of the Signal chat leak, prompting calls for accountability and future security measures ...