This even though, early on, Steele's claims failed to bear scrutiny. Just how far off the claims were became clear when the FBI interviewed Steele's "Primary Subsource" over three days beginning on Feb. 9, 2017. Notes taken by FBI agents of those interviews were released by the Senate Judiciary Committee Friday afternoon.

The Primary Subsource was in reality Steele's sole source, a long-time Russian-speaking contractor for the former British spy's company, Orbis Business Intelligence. In turn, the Primary Subsource had a group of friends in Russia. All of their names remain redacted. From the FBI interviews it becomes clear that the Primary Subsource and his friends peddled warmed-over rumors and laughable gossip that Steele dressed up as formal intelligence memos.

Paul Manafort: The Steele dossier's "Primary Subsource" admitted to the FBI "that he was 'clueless' about who Manafort was, and that this was a 'strange task' to have been given." AP Photo/Seth Wenig, File

Steele's operation didn't rely on great expertise, to judge from the Primary Subsource's account. He described to the FBI the instructions Steele had given him sometime in the spring of 2016 regarding Paul Manafort: "Do you know [about] Manafort? Find out about Manafort's dealings with Ukraine, his dealings with other countries, and any corrupt schemes." The Primary Subsource admitted to the FBI "that he was 'clueless' about who Manafort was, and that this was a 'strange task' to have been given."