During a cooperation agreement, Special Prosecutor Robert Mueller did not ask Paul Manafort for allegations that he had visited WikiLeaks founder Julian Assange in London in 2016, according to a source familiar with the case.
"That shows how much of it was thought of," the source said.
The Guardian newspaper reported in November that Manafort visited the Ecuadorian embassy in London three times, where Mr Assange applied for asylum in 2014. Both Manafort and Wikileaks have vehemently denied the story, which was not the case supported by other news agencies.
It was another Trump-Russian "bombshell, if it is true". The Guardian allegation created a new suspicion of collusion in the election year as Wikileaks publicly publicized thousands of e-mails and Democratic Party documents stolen by Russian activists.
The source said the lack of interviews showed that Mr. Muller did not seriously accept the indictment during the debriefing of his team in Manafort as part of a goodwill agreement.
A spokesman for Müller declined to comment.
Mr. Mueller ended his Russian investigation on March 22 and found that no election conspiracy had taken place between the Kremlin and President Trump or his campaign.
According to the Guardian report, the Washington Times reviewed the three passes used in 201
Mr. Assange threatened the Guardian with a defamation lawsuit.
Wikileaks' statement on Twitter said: "Remember that day when the Guardian allowed a serial maker to completely destroy the newspaper's reputation. @Wikileaks is ready to give the Guardian a million dollars and the head of its publisher that Manafort never met with Assange.
The reference to "manufacturer" referred to an Ecuadorian intelligence source: "This story is totally false and deliberately defamatory. I have never met Julian Assange or anyone associated with him. I have never been contacted by anyone directly or indirectly affiliated with WikiLeaks. I have never contacted Assange or WikiLeaks. We consider all legal options against the Guardian, who continued with this story, even after he had been informed by my representatives that this was wrong.
The Guardian story is by Luke Harding, a proponent of a Trump-Russian plot and an advocate of Christopher Steele, the former British intelligence official who drafted the anti-Trump dossier for Hillary Clinton's campaign and the Democratic National Committee wrote.
None of Mr. Steele's central agreements has been publicly proven.
As a political consultant Manafort was a frequent flyer. One of his business clients was the government of Ecuador, which he visited in 2017.
Manafort was convicted by the Virginia Jury for tax and bank fraud. In Washington, DC, he pleaded guilty to conspiring the United Starts, and agreed to lose more than $ 40 million. The conspiracy included money laundering, tax fraud and a lobbying violation.
Subsequently, Mr Muller Manafort allegedly lied in the co-operation phase, but they were not alleged visits to London.
Two judges sentenced him to a total of 7½ years in prison.