You have that exactly backwards, Goriam.
Lets just put it this way. Trump is the president for better or for worse (it's worse). If this FISA thing is so damning and can prove his innocence, He could legally declassify and release it at any moment.
This is nothing but kabuki theater here folks.
It is the obligation of the state to prove beyond a reasonable doubt that a defendant is guilty. No one is required to prove themselves innocent. Innocence is presumed.