The team led by U.S. President Donald Trump's national security adviser, Mike Waltz, set up at least 20 group chats on the commercial Signal app to coordinate official work on issues involving China,

When Donald Trump selected Mike Waltz to serve as national security adviser, the choice was widely seen as win-win: A combat veteran with four Bronze Stars would bring his judgment to the White House and his deep-red Florida House district was safe in Republican hands.

Trump’s national security adviser is trying to manage his way out of a crisis. But new revelations about his team’s operational security are piling up in the inbox.

The team of President Donald Trump's national security adviser, Mike Waltz, set up at least 20 group chats on the commercial Signal app to coordinate official work on issues involving China, Gaza, Middle East policy,

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

In public, President Trump has defended his national security adviser. But behind the scenes, he has cast around for advice.

Representative Jimmy Gomez (D-CA) joins José Díaz-Balart on MSNBC to talk about cybersecurity concerns following the Signal chat scandal. Gomez underscores the dangerous fallout from this breach, questioning ‘how many more’ Signal chats are there?

Elections in two states today offer a test of Trump’s popularity. What’s happening: Top officials at the National Institutes of Health, CDC and FDA were put on leave and other employees were laid off as the government seeks to cut thousands of jobs.