User “mdh2” on Bluesky claims that Mike Waltz wasn’t caught using Signal on his phone, but something far worse: “TM SGNL”, an app made by an Israeli company called “CyberInt”. mdh2 claims that messages on that chat platform are backed up on 3rd party servers.
This appears correct. The screenshot from Mike Waltz’s phone shows the “TM SGNL” product name.
bsky post (login required): hxxps://bsky.app/profile/mdh2.bsky.social/post/3lo57bdld2c2q