Cohen also filed a separate suit against Fusion GPS, the research firm that was behind the document.
It's not made up. Donald Trump has happily parroted Putin's denials as evidence of his own innocence.
Donald Trump's personal attorney Michael Cohen sued Buzzfeed on Tuesday for defamation over allegations about him in a dossier the news organization published that was commissioned in 2016 by the president's political opponents.
On Tuesday, Feinstein made public the transcript of a 10-hour interview with Judiciary Committee investigators and Fusion GPS chief Glenn Simpson.
Feinstein's action comes alongside an effort by Republicans to discredit the dossier as a politically motivated document that the FBI has relied too heavily upon in its investigation. Feinstein bucked Judiciary committee Republicans by releasing the transcript.
What Republicans (and Trump in particular) fear most is information making it to the eyes and ears of the American people, allowing them to decide for themselves what they believe.
"We learned that his job included dealing with inquiries about Russian Federation and he seemed to get all of the serious inquiries, investigative inquiries about Russian Federation. Its interest to the public is obvious", Buzzfeed spokesman Matt Mittenthal said in a statement. Feinstein told reporters that she didn't tell Grassley beforehand, and "I owe him an apology and I will give him an apology as soon as I see him".
President Donald Trump says that it "seems unlikely" that he'd give an interview in special counsel Robert Mueller's investigation into potential coordination between Russian Federation and the Trump campaign.
"It was someone like us who chose to pick up the phone and report something", Simpson said. "Chris has a sterling reputation as a person who does not exaggerate, does not make things up, doesn't sell baloney".
Fusion hired Steele in May or June of 2016, after exhausting open-source methods of investigating Trump, Simpson said. "Russia & the world is laughing at the stupidity they are witnessing".
But if Simpson is telling the truth in only two central contentions - that the FBI investigation predated Steele's work, and that Steele was concerned about the FBI's lean to Trump, rather than to Clinton - then his testimony unravels what was already a conspiracy theory of very big proportions.
The dossier, which Simpson has described as more of a series of memos, went on to describe a web of relationships between Trump associates and Russians, as well as an infamous unverified passage about Trump's supposed conduct in a Moscow hotel room.
Former intelligence agent Christopher Steele took his concerns to the Federal Bureau of Investigation in July 2016, the Senate was told. "Media outlets don't have a hall pass to disseminate and publish sexy stories to garner publicity at the expense of trashing the reparation of Trump campers", he said.
Steele and Fusion GPS arranged for the material to pass into the hands of Sen. The Steele dossier obviously contains information that the president finds erroneous.
One fascinating detail begs more questions, however.
"He said he was professionally obligated to do it", Simpson said.
"The allegation that we were working for the Russian government then or ever is simply not true". "I was stunned", Simpson told the committee.
The dossier - because of its allegations and questions surrounding its origin - has become an explosive political issue. "We assessed it for credibility", he said.
In fact, there are only two ways to read the Simpson interview: either it says nothing, or it has blown up months of carefully constructed conspiracy theorizing. We have a long history of that.