"Line up [Mike] Flynn, Cohen and Manafort as cooperating prosecution witnesses and you've got a prospect that explains the panic in Trumpland". But he has not shown a willingness to help investigators, instead vigorously maintaining his innocence and attacking his prosecution as illegitimate. He also said that there was no evidence Manafort tried to tamper.
Mr Mueller's team this month asked the judge to revoke Mr Manafort's bail. Manafort pleaded not guilty to that charge on Friday but U.S. District Judge Amy Berman Jackson in Washington revoked his bail, sending him to jail.
The messages suggested that Manafort was seeking to have Friedman confirm that the campaign he worked on to polish the image of Ukraine and its then-president Viktor Yanukovych was focused on Europe.
Trump tweeted a response to Manafort's jailing, defending his former campaign manager.
"Well, I feel badly about a lot of them, because I think a lot of it is very unfair", Mr. Trump said.
The president also referred incorrectly to Manafort's pre-trial detention, calling it a "tough sentence".
After turning himself in to the Federal Bureau of Investigation in October, Manafort was placed under house arrest on a $10m bond.
In a separate development, Mr Trump's lawyer Rudy Giuliani said that there is a "good chance" that the president will decide next week whether he will sit down for an interview with Mr Mueller.
Andres revealed that one of the witnesses was driving with his wife in rural Italy when Manafort contacted him on February 24, the day after he was indicted on expanded charges in Washington.
It was the latest episode in the fall of Manafort, a longtime political operator and businessman who has been a focus of Mueller's investigation into Russia's role in the 2016 USA presidential election. The prosecutors appeared to agree with the plan, according to court filings.
Last week, Mr Manafort and his aide, Konstantin Kilimnik, were charged with witness tampering. "It is not about the conduct of the Office of Special Counsel".
Manafort's attorneys have denied the tampering allegations and accused prosecutors of conjuring charges to pressure him to flip his plea and turn against Trump and his associates. In total, Manafort faces seven criminal charges in DC federal court. The group included one unidentified former European chancellor.
It described how Mr Manafort had designed a programme that used the Hapsburg members to lobby U.S. politicians and influence American public opinion, including meetings on Capitol Hill.
While Jackson said she struggled with the decision, she accused Manafort of treating the proceedings as "just another marketing exercise".
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