The chat app, which is run by a nonprofit foundation, has been downloaded 220 million times. Here’s what to know about Signal, including who owns it and whether it’s safe to use.

The request by American Oversight came after revelations that Defense Secretary Pete Hegseth shared information on upcoming strikes in more than one group chat.

President Trump is publicly standing by Defense Secretary Pete Hegseth amid scrutiny over his use of a Signal chat. It was revealed that Hegseth used his personal phone to share details about impending strikes in Yemen on a private thread that included his wife,