The FBI relied heavily on news articles and open sources in its efforts to corroborate claims in the infamous Steele dossier that was used to obtain a spy warrant on members of the Trump 2016 presidential campaign, according to a recently declassified spreadsheet kept by bureau analysts.
CBS News reporter Catherine Herridge and Just the News founder John Solomon were the first to publish the document (pdf), a watermark on which states that it was produced to the Senate Judiciary and Intelligence committees.
