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

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

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

President Donald Trump and his administration raised eyebrows about how they handled sensitive national security information ...

The national security adviser's use of the messaging app is under scrutiny after he mistakenly added a journalist to a ...

President Trump on Thursday confirmed a reported purge of national security agencies this week, with firings of at least a ...

President Donald Trump has abruptly fired the director of the National Security Agency, according to U.S. officials and ...

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

As with any security-focused app, the security is only as robust as the person using it. Signal is designed to encrypt your ...

The president of Signal defended the security of the encrypted messaging app on Tuesday after a bombshell report revealed top ...

President Donald Trump responded to questions about his national security officials using a group chat app that included a ...

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