
The Mueller Report contained passing references to some of the dossier's allegations but little mention of its more sensational claims. intelligence community took the allegations seriously, and the Federal Bureau of Investigation (FBI) investigated every line of the dossier and identified and spoke with at least two of Steele's sources. The intelligence community and most experts have treated the dossier with caution due to its unverified allegations, that Trump denounced as fake news. While compiling the dossier, Steele passed some of his findings to both British and American intelligence services.

DNC officials denied knowing their attorney had contracted with Fusion GPS, and Steele asserted he was not aware the Clinton campaign was the recipient of his research until months after he contracted with Fusion GPS. In June 2016, Fusion GPS subcontracted Steele's firm to compile the dossier. BuzzFeed 's decision to publish the reports without verifying their allegations was criticized by journalists but their decision was also defended in a court statement explaining that BuzzFeed 's action was for the public good as the public had a right to know so it could "exercise effective oversight of the government". It also alleges that Russia sought to damage Hillary Clinton's candidacy. The dossier's 17 reports allege that Trump campaign members and Russian operatives had conspired to cooperate in Russia's election interference to benefit Trump. Steele, a former head of the Russia Desk for British intelligence (MI6), was writing the report for the private investigative firm Fusion GPS, who were paid by Hillary Clinton's campaign and the Democratic National Committee (DNC). The dossier, leaked by BuzzFeed News in January 2017, without its author's permission, is an unfinished 35-page compilation of raw intelligence based on information from initially anonymous sources known to the author, counterintelligence specialist Christopher Steele. Some key dossier allegations were corroborated in the ODNI's 2017 assessment, namely that Vladimir Putin favored Trump over Hillary Clinton that he personally ordered an "influence campaign" to harm Clinton's electoral chances and "undermine public faith in the US democratic process" that he ordered cyber attacks on the Democratic and Republican parties and that many Trump campaign officials and associates had numerous secretive contacts with Russian officials and spies.

Five years later, it was described by mainstream media as "largely discredited", "deeply flawed", and "largely unverified". The Steele dossier, also known as the Trump–Russia dossier, is a controversial political opposition research report written from June to December 2016, containing allegations of misconduct, conspiracy, and cooperation between Donald Trump's presidential campaign and the government of Russia prior to and during the 2016 election campaign.
