Here's what to know about the messaging app used by Trump Administration officials to discuss military strikes on Yemen.

Defense Secretary Pete Hegseth and other Trump officials allegedly used Signal for a group chat to discuss a highly sensitive operation.

The nonprofit Signal Foundation was set up in 2018 to support the app’s operations as well as “investigate the future of private communication,” according to the foundation’s website.

High-level Trump officials used the digital messaging app Signal to communicate sensitive details about an impending military strike against Houthi terrorists in Yemen earlier this month, sparking ...

The nonprofit Signal Foundation was set up in 2018 to support the app's operations as well as "investigate the future of private communication," according to the foundation's website.

The nonprofit Signal Foundation was set up in 2018 to support the app’s operations as well as “investigate the future of private communication,” according to the foundation’s website.

Atlantic Editor-in-Chief Jeffrey Goldberg detailed a discussion that happened over the Signal messaging app hours before strikes on Iran-backed Houthi-rebels in Yemen ordered by U.S. President ...

Here's a look at the app in question. What is Signal? It's an app that can be used for direct messaging and group chats as well as phone and video calls.

Here's a look at the app in question. What is Signal? It's an app that can be used for direct messaging and group chats as well as phone and video calls.

Here's a look at the app in question. What is Signal? It's an app that can be used for direct messaging and group chats as well as phone and video calls.

Encryption on Signal is turned on by default, unlike another popular messaging app, Telegram, which requires users to turn it on and does not make it available for group chats.

High-level Trump officials used the digital messaging app Signal to communicate sensitive details about an impending military strike against Houthi terrorists in Yemen earlier this month, sparking ...