On Friday, a judge ordered that Manafort's bail be revoked and he be sent to jail as Special Counsel Robert Mueller's Russian Federation investigation lodged new charges of witness tampering against Manafort.
The new indictment that led to this result said that FBI Special Agent Brock W. Domin's testimony and evidence would show that Manafort attempted to tamper with witnesses.
Manafort entered a not guilty plea to charges for witness tampering and conspiracy to obstruct justice.
He had been confined to his home in the Washington suburb of Alexandria, Virginia and forced to wear a Global Positioning System monitoring device since October.
Manafort faces a trial before Jackson on September 17 and a trial on July 25 in Alexandria, Virginia, on bank- and tax-fraud charges.
He pleaded not guilty on the charges imposed on him and had been on home confinement in Virginia.
But Manafort worked on the campaign for a critical period in the campaign, from April to August, 2016, which included the latter critical stages of securing delegates to win the nomination, and then to the Republican convention.
Trump distanced himself from Manafort on Friday during a free-wheeling discussion with reporters outside the White House that took place before Manafort's bail was revoked.
Jackson said that she "cannot turn a blind eye to this", adding, "You have abused the trust placed in you six months ago". They said that if the prosecution would reveal who the witnesses are, Manafort could be ordered not to make contact with them.
Paul Manafort is going to jail, and the screws squeezing him to reveal any damaging information he might know about President Trump just got tighter.
Prosecutors say Mr Manafort and Mr Kilimnik tried to get the two witnesses to say that lobbying work carried out by clandestinely paid former politicians only occurred in Europe and not the USA, a contention the two witnesses said they knew to be false.
Manafort's business partner Rick Gates, who was also charged with a slew of federal crimes earlier this year, had entered a plea deal with the Special Counsel and is working with prosecutors on the Russian Federation investigation.
But the president also declined to say directly whether he believes Manafort or others who are part of Mueller's probe should be pardoned.
Mr. Manafort was campaign chairman for Mr. Trump for two months in the summer of 2016, and had a lesser role in the campaign before being promoted to chairman. "Manafort has nothing to do with our campaign". "I feel badly for some people, because they've gone back 12 years to find things about somebody, and I don't think it's right".
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