The Steele dossier, also known as the Trump–Russia dossier, is a controversial political opposition research report compiled by Christopher Steele that was published without permission as an unfinished 35-page compilation of "unverified, and potentially unverifiable" raw intelligence reports—"not established facts, but a starting point for further investigation". It was written from June to December 2016 and contains 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. Several key allegations made in June 2016 about the Russian government's efforts to get Trump elected were later described as "prescient" because they were corroborated six months later in the January 2017 report by the Office of the Director of National Intelligence and the Mueller Report, namely that Vladimir Putin favored Trump over Hillary Clinton; that he personally ordered an "influence campaign" to harm Clinton's campaign and to "undermine public faith in the US democratic process"; that he ordered cyberattacks on both parties; and that many Trump campaign officials and associates had numerous secretive contacts with Russian officials and agents.

John Owen Brennan is a former American intelligence officer who served as the Director of the Central Intelligence Agency (CIA) from March 2013 to January 2017. He served as chief counterterrorism advisor to U.S. President Barack Obama, with the title Deputy National Security Advisor for Homeland Security and Counterterrorism, and Assistant to the President. Previously, he advised Obama on foreign policy and intelligence issues during the 2008 election campaign and presidential transition.