Director of National Intelligence Tulsi Gabbard has testified today that Signal has been preinstalled on US government devices and they use it for secure comms on the advice of CISA.
I think CISA may get thrown under the bus on this one too. Signal may be too — today Trump suggested it was a “bad signal”.
https://www.bbc.co.uk/news/live/cz9e875gd11t?post=asset%3A63bdec8c-2e34-4fbc-943a-655e36bde40f#post