Fruit of the poisonous tree wouldn't apply here, though. 
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- Edit 1Before modification by Ghavrel at 04/02/2018 07:53:15 AM
I can't think of any obstruction charge that would require the dossier itself to be admitted into evidence.
And while you as someone who respects due process might be against the FISA process, Congress has been more than content to allow it to continue unchallenged in the past.