"I would say it's a good hypothesis that he never meant to cooperate and that he's angling for a pardon at some point in time", Wisenberg said.
Giuliani, a former federal prosecutor and New York City mayor who is representing Trump in the Mueller probe, said Manafort's lawyer told him the Guardian story is wrong.
Instead of citing official logs, the Guardian's latest reporting relies heavily on SENAIN's document, which critics argued is questionable at best given that SENAIN may have political motivations to discredit WikiLeaks for publishing secret agency documents in the past.
The Guardian's story claims that Manafort met with Assange at the Ecuadorian Embassy in London on three separate occasions - 2013, 2015, and March 2016.
CNN reports that Mr Mueller is also investigating whether Wikileaks or Mr Assange were discussed during a 2017 meeting between Mr Manafort and Ecuadorean President Lenin Moreno.
"We are considering all legal options against the Guardian".
WikiLeaks denied the report, tweeting that it was "willing to bet the Guardian a million dollars and its editor's head that Manafort never met Assange".
"Do you think this report makes it more likely that Paul Manafort or his allies on the Trump campaign could be on the other side of that original Mueller indictment of the Russians, as co-conspirators?" The next month they hacked into the Democratic Congressional Campaign Committee and the Democratic National Committee. The report was based on unnamed sources and the outlet noted that the embassy has no record of Manafort's alleged 2016 visit.
So far the parties involved have either strongly denied the report or, like press secretary Sarah Sanders, demurred from commenting upon it one way or another.
Manafort's lawyers say that's not so - they said he believes he has offered "useful information".
Manafort has been at the heart of several unresolved threads of the Robert Mueller investigation. "But the last meeting is likely to come under scrutiny and could interest Robert Mueller, the special prosecutor who is investigating alleged collusion between the Trump campaign and Russian Federation".
United States investigators are scrutinising whether the Trump campaign was aware of Wikileaks' role in the leaking of Democratic emails that were allegedly stolen by Russian hackers during the American presidential race two years ago.