"You have abused the trust placed in you six months ago", Judge Amy Berman Jackson was quoted by the Washington Post as saying.
Manafort turned around briefly to wave to his wife before heading out a door at the back of the crowded courtroom, witnesses said.
"This isn't middle school, I can't take your phone", Jackson said.
"I feel bad about a lot of it because I think a lot of it is very unfair", he said. This comes after he was already facing the possibility of decades behind bars on charges of financial fraud. In fact, Manafort served there for almost five months. Still, it's unclear whether the move will push Manafort to cooperate with prosecutors.
Paul Manafort arrives at federal court Friday in Washington. Didn't know Manafort was the head of the Mob. "Very unfair!" Those were references to James Comey, whom Trump fired as Federal Bureau of Investigation director, and Hillary Clinton, the 2016 Democratic presidential nominee.
Speaking to reporters at the White House on Friday, Trump insisted that Manafort only worked on the campaign "for a very short period of time". In 2016, Manafort served as Trump's campaign chairman during the Republican National Convention.
President Trump tweeted on Friday to call the decision to jail Manafort "tough".
Giuliani later backtracked from his suggestion pardons might be coming. Manafort hasn't been convicted of any crimes or sentenced.
Manafort in court has pleaded not guilty to the new charges for obstructing justice.
Manafort's lawyers have accused prosecutors of conjuring a "sinister plot" out of "innocuous" contacts. He faces several felony charges - including tax evasion, bank fraud, money-laundering conspiracy and acting as an unregistered foreign agent - related to his Ukrainian political work, money he funneled through offshore accounts and loans he took out on property in the U.S. Most of the criminal counts relate to activity that preceded his time as Trump's campaign manager, from March to August of 2016, when he resigned amid news reports that he had received secret cash payments for his Ukraine consulting.
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Manafort will learn whether he must await trial in prison or can remain on house arrest following allegations that he tried to obstruct the Russian Federation inquiry. In December, they accused him of violating a court's gag order by helping ghostwrite an op-ed piece defending his work in Ukraine for an English-language newspaper in Kiev.
Jackson, the judge, declined to punish Manafort then but warned she would probably consider similar actions in the future as a violation.
But the president also stuck up for him, suggesting that Manafort's alleged crimes are too old to prosecute.
After Manafort allegedly tried to contact witnesses in his upcoming trial for conspiracy and money laundering, a judge revoked Manafort's bail Friday.
Mueller last week charged him with witness tampering in the case.
Defence attorneys said Manafort didn't know who the government witnesses are. "At the least, he has shown he is adept" at making them. Both witnesses said that wasn't true. "A clear no-contact order will solve the problem", Westling suggested. And he argued that Manafort could not have known the men he contacted were witnesses.
Legal experts say Mueller wants to keep applying pressure on Manafort to plead guilty and assist prosecutors as Gates did and is cooperating with the probe after cutting a plea deal.
None of the charges against them relate to alleged collusion with Russian Federation.
A June 8 indictment accused Manafort and a longtime aide, Konstantin Kilimnik, with tampering with witnesses about their past lobbying for Ukraine.
Kilimnik, whom Mueller´s office says has ties to Russian intelligence, could not be reached for comment.