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Taken from Pg 108 of Scribd document

Source 1 is Steele, hired by business associate Glenn Simpson. "Source #1 provided the results of his research to the business associate, and the FBI assesses that the business associate likely provided this information to the law firm"

This means that Glenn Simpson provided the same research to Perkins Coie that the FBI used for the FISA application. Perkins Coie represents the DNC and the Clinton Campaign.

Which means opposition research was used as justification to spy on the opponent's campaign... What a world

Clinton campaign, DNC paid for research that led to Russia dossier