And the issue isn't that some evidence is classified, but that all evidence Snowden would want to present is classified. Even his motivation is based on works that are claimed to be classified.
If Snowden can't present a single piece of evidence in his defense that isn't classified, I don't think he's got much of a case. Last I checked, the constitution isn't classified.
You can't have a fair trial where 99% of the evidence is not allowed to be submitted.
The US has Whistle-Blower laws for a reason, yet the US Government is not allowing them to cover his case.
Until a guarantee of a free trial, he has stated he'll remain where he's at. And that's entirely reasonable.
Which the US Government is not allowing. We've looped back to the beginning here... and you still don't understand, don't accept, or don't know the entire narrative.