A photo taken this week showed Mike Waltz using an app that looks like—but is not—Signal to communicate with top officials. "I don't even know where to start with this," says one expert.

The Trump administration ousted national security advisor Mike Waltz and other staffers with the National Security Council, Fox News Digital confirmed.

The communications app TeleMessage, which was spotted on former US national security adviser Mike Waltz's phone, has suspended “all services” as it investigates reports of at least one breach.

Days after former National Security Adviser Mike Waltz was caught using a knock-off Signal app, a hacker broke into the ...

President Donald Trump announced that Mike Waltz had been ousted as national security advisor. He was previously caught up in "Signalgate." ...

More than a month after he drew criticism for using Signal to discuss an impending military attack, Waltz was seen using what ...

Signalgate was the national security adviser’s most glaring mistake. But his problems ran deeper. After Michael Waltz, the ...

National security adviser Mike Waltz is leaving his White House post, although soon after reports about his departure were ...

WASHINGTON − Mike Waltz is out as President Donald ... On the day of the initial Atlantic report revealing the Signal chat, Waltz said he took "full responsibility" for the "embarrassing ...

The president says Waltz, who started the leaked Signal chat, will be nominated as US ambassador to the UN and be temporarily replaced by Secretary of State Marco Rubio.

President Donald Trump has removed Mike Waltz as national security adviser and instead will nominate him for United Nations ...

There are some hurdles former National Security Advisor Mike Waltz must clear first before the United Nations ambassador job is his — including undergoing a Senate confirmation process.