Beginning in March 2016, Danchenko was tasked by Christopher Steele to investigate
Paul Manafort, as well as
Donald Trump,
Sergei Ivanov,
Carter Page, and
Michael Cohen. Some parts of the information contributed by Danchenko became part of the FBI's foreign intelligence surveillance warrants on Carter Page. One of Danchenko's primary sources for information about the alleged collusion between the
Donald Trump 2016 presidential campaign and the Russian government was allegedly Olga Galkina, a Russian public-relations executive and former parliamentary correspondent for
RIA Novosti. According to the Durham indictment, Galkina told Dolan in emails that she was a "big Hillary fan" and hoped to obtain a State Department position if Clinton won the election. Galkina, a longtime friend of Danchenko, has denied being one of his sources. On December 20, 2016, Danchenko was personally identified as Steele's Primary Sub-source by FBI supervisory intelligence analyst, Brian Auten. In January 2017, shortly after
BuzzFeed News published the Steele dossier, Danchenko was contacted by the FBI for an interview. About a week and a half later, in exchange for
legal immunity, In March 2017, the FBI signed up Danchenko to be a paid confidential informant; the relationship was terminated by the FBI in October 2020 after paying Danchenko over $200,000. The FBI leadership found that Danchenko was "truthful and cooperative" but rank and file agents did not agree. The FBI's Supervisory Intel Analyst said that "it was his impression that the Primary Sub-source may not have been 'completely truthful' and may have been minimizing certain aspects of what he/she told Steele". He also "believed that there were instances where the Primary Sub-source was 'minimizing' certain facts but did not believe that he/she was 'completely fabricating' events". He added that he "did not know whether he could support a 'blanket statement' that the Primary Sub-source had been truthful". In July 2020, Senator
Lindsey Graham, Republican of South Carolina, who chaired the Judiciary Committee, released a 59-page, redacted FBI summary of the FBI's interview with Danchenko, while referring to the entire Russia investigation as "corrupt". In the FBI summary, Danchenko was referred to anonymously as the "Primary Subsource" for the Steele Dossier. Shortly after the release of the summary, Danchenko was identified online as the "Primary Subsource"; he was named in a newly created blog; the blog post was then promoted by a pseudonymous
Twitter account created two months earlier, and the identity of Danchenko was amplified by
RT, the English-language
Kremlin propaganda outlet. ==Durham investigation, trial and acquittal==