As far as I can tell, North Korea doesn't even exist because I've never been there.
A Congressional subpoena is used to get something into the public eye for political purposes, not for criminal prosecution. The real story here is going on behind the scenes, and I'm not sure I can even guess at how it will unfold.
“and I’m not sure I can even guess at how it will unfold.”
We know that after several months there have been no arrests and no charges. No high profile perp walks and no evidence of a Grand Jury.
I say asleep at the wheel.
I've been there (within the DMZ) and I took pictures. Would you accept eyewitness testimony as proof?