Sen. John McCain said he did 'what any citizen would do' in turning the dirty dossier, which contained unconfirmed secrets about the president-elect, over to the FBI.
The Guardian charted the path of how the dossier came to be and how it was that McCain got his hands on the controversial documents.
The story of the dossier began with an investigative firm in Washington, D.C., being tapped by one of Trump's primary allies to dig up some opposition research on the Republican hopeful.
In turn, that firm outsourced the research to a 'retired western European former counter-intelligence official, with a long history of dealing with the shadow world of Moscow’s spooks and siloviki (securocrats),' explained the Guardian.
Yesterday, the Wall Street Journal identified the ex-spy as Christopher Steele.
By the time the contractor had started digging, Trump's primary opponent had dropped out. But the firm found a Democrat who wanted dirt on the now Republican nominee instead.
The Guardian pointed out that just because a Democrat was willing to pay for the information that didn't mean that said Democrat was Hillary Clinton's campaign or the Democratic National Committee.
Sometimes donors seek out this information in order to ensure they've made a sound investment.
The contractor, who the Guardian didn't name, but the Wall Street Journal identified as Steele, reportedly found the information that he dug up to be concerning. He and another ex-British diplomat, Christopher Burrows, run their own company, Orbis Business Intelligence.
'If the allegations were real, their implications were overwhelming,' the Guardian wrote.
So over the summer he delivered the intelligence he had gathered from his Russian sources, living within the country and also in the west, to former colleagues in the FBI.
The Guardian suggested he also delivered the documents to his country's own intelligence service.
As fall approached, and he heard nothing about any FBI investigation into the documents, he was persuaded to tell journalist David Corn, of Mother Jones, of their existence.
On November 18, at the Halifax International Security Forum, McCain was introduced to a 'former senior western diplomat' who had set eyes on the documents and knew who put them together, telling the Arizona Republican that the individual was 'highly reliable.'
From there, McCain dispatched a 'trusted emissary' who flew across the Atlantic to meet the source of the documents at an airport that the Guardian did not name.
The U.S. official was instructed to look for a man with a copy of the Financial Times and that's how the individuals met, with the source taking McCain's emissary back to his house and gave the American a copy of the documents.
Within 24 hours, the dossier was in Washington, though the contents of the file couldn't be verified without an investigation.
McCain, the Guardian said, was worried that his meddling might be interpreted as revenge for some of the controversial comments Trump made about him – such as knocking the fact that the longtime senator had been a prisoner of war.
However, McCain decided to hand over the documents to FBI Director James Comey on December 9.
'Upon examination of the contents, and unable to make a judgment about their accuracy, I delivered the information to the Director of the FBI,' McCain said Wednesday in a statement about that matter.
'That has been the extent of my contact with the FBI or any other government agency regarding this issue,' McCain said.