In January 2018, ABC News described how the FBI would not open an investigation into the Trump campaign based on one document like Steele's unverified report but the FBI still needed to investigate its allegations "rather than accept them as evidence".[10] The Russian interference investigation was opened because of previously existing concerns: John Brennan testified he was already "aware of intelligence and information about contacts between Russian officials and U.S. persons that raised concerns" and it was that knowledge that "served as the basis for the FBI investigation to determine whether such collusion [or] cooperation occurred".[10] ABC wrote that "For the FBI, the dossier was essentially just another tip" that must be investigated.[10]
The Mueller Report, a summary of the findings of the Special Counsel investigation into Russian interference in the 2016 U.S. elections, contained passing references to some of the dossier's allegations but little mention of its more sensational claims. It was a major subject of the Nunes memo, the Democratic rebuttal memo,[442] and the Inspector General report on the Crossfire Hurricane investigation.