In court documents, prosecutors working for the special counsel, Robert S. Mueller III, said that Mr. Manafort tried to contact witnesses by phone and through an encrypted messaging program.
Because witness tampering is a crime, and Manafort's bail provisions warn that he shouldn't break the law while awaiting trial, the prosecutors argue they have "little confidence that restrictions short of detention will assure Manafort's compliance", the filing said. They asked a federal judge to revise the terms of his release or revoke it entirely, which would send him to jail until trial.
In the latest filing, Mueller's team says Manafort obstructed justice and attempted to "suborn perjury" by contacting the witnesses.
The communications were 'in an effort to influence their testimony and to otherwise hide evidence, ' Domin wrote.
The FBI said that it had obtained statements from both of the witnesses as well as telephone records and documents Manafort stored on a cloud service, which show his communications with the witnesses.
Former House Speaker and Trump ally Newt Gingrich warned President Trump against pardoning himself should special counsel Robert Mueller pursue charges in the ongoing Russian Federation investigation, telling "CBS This Morning" on Tuesday that it would be an "arrogant statement of power" if he did so.
Mueller has charged Manafort with making false statements, money-laundering conspiracy and acting as an unregistered foreign agent for work he did for the Ukrainian government.
Russian Federation gifts North Korea's Kim Jong-un a ‘box for secrets’
Kelly meeting him at the ceremonial diplomatic entrance on the South Lawn in full view of television cameras and photographers. North Korea's nuclear weapons programme has made significant advances in recent years and poses a threat to the United States.
Manafort allegedly paid the group some $2.5 million in 2012 and 2013 alone. "I have made clear that [the Hapsburg group] worked in Europe".
The two witnesses are also not named in court filings.
The motion seeks to have Manafort's condition release revoked.
The case is being brought by Robert Mueller, the special counsel leading an investigation into whether the Trump campaign colluded with Russian Federation.
Mr. Manafort is the most senior member of Mr. Trump's campaign to be indicted, although the charges do not relate to campaign activities. "As only one of two people left who could become President, why wouldn't the Federal Bureau of Investigation or Department of "Justice" have told me that they were secretly investigating Paul Manafort", he asked.
Why didn't the FBI warn off then candidate Trump from one or the other of the figures who appears to have prompted the initiation of the counterintelligence investigation penetrating his campaign.
Paul Manafort has been accused in an indictment of acting as an unregistered foreign agent by lobbying in the us on behalf of Ukrainian interests.