[theintern]

That was my thought as well. Given all communication is considered compromised, I can't think of a simple way to do this that isn't a face to face.

[DINKDINK]

Could you explain how exchanging PGP keys over TLS would be compromised or compromisable?

[belovedeagle]

Simple. Analog man-in-the-middle; i.e., you're not talking to who you think you're talking to. That's the whole point of key exchange.