The recent national security breach involving a Signal group chat has raised concerns regarding the messaging app’s security.

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

Democratic leaders of key House committees are reigniting calling for national security adviser Mike Waltz to step down.

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.

In the aftermath of the Trump administration's military attack plans scandal, many are left wondering why sensitive national ...

The team led by U.S. President Donald Trump's national security adviser, Mike Waltz, set up at least 20 group chats on the ...

President Trump was urged by far-right activist Laura Loomer to purge staffers she deemed insufficiently committed to his ...

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

So let me get this straight. A meeting to discuss high-level U.S. war plans was done on a private messaging APP not cleared for such high-level security discussions. Presumably, a foreign ...

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

The people say Loomer made her case for the firings in an Oval Office meeting attended by Trump and other top officials.