For weeks, UN officials have been on tenterhooks waiting to see who US President Donald Trump would appoint as his ambassador ...

A photo taken this week showed Mike Waltz using an app that looks like—but is not—Signal to communicate with top officials.

US president Donald Trump said ­yesterday he is nominating his national security adviser Mike Waltz to serve as United ...

Mike Waltz, the national security adviser for President Donald Trump, is seen in photos using Signal during a Cabinet meeting ...

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

Donald Trump removed Mike Waltz from his post as national security adviser — marking the first significant personnel overhaul ...

Mr Waltz came under searing scrutiny in March after revelations that he added journalist Jeffrey Goldberg to a private text ...

Mike Waltz was fired as national security advisor after being caught using the encrypted messaging app Signal during a ...

U.S. President Donald Trump ousted his national security adviser Mike Waltz on Thursday and named Secretary of State Marco ...

Donald Trump has tapped secretary of state Marco Rubio to be interim national security adviser after firing Mike Waltz and ...

National Security Advisor Michael Waltz, who was fired the day before, will become the US Ambassador to the UN.US President ...

Waltz was among high-ranking members of the administration who accidentally shared plans about a forthcoming U.S. military ...