Manafort has had a rough 11 months, beginning with last summer's pre-dawn raid of his Alexandria home, but one of his few comforts since the first indictment against him in October has been the ability to remain in that home, a $2.7 million property in one of the Washington area's poshest neighborhoods.
Judge Amy Berman Jackson refused, and sent him to jail.
"Manafort and Kilimnik repeatedly contacted Persons D1 and D2 in an effort to secure materially false testimony", prosecutors alleged in court papers.
"[He] has nothing to do with our campaign, but I tell you I feel a little badly about it", Mr Trump said. Gates came on board with Manafort and stayed for the duration of the campaign, later serving as deputy chairman for Trump's inaugural committee and then starting a pro-Trump PAC.
Manafort, who just two summers ago was celebrating Donald Trump's nomination at the Republican National Convention, was charged last week along with Russian business associate Konstantin Kilimnik as part of an alleged scheme to tamper with two witnesses in the existing cases against Manafort. It is not about the conduct of the office of special counsel.
The move drastically ratchets up pressure on Manafort as Mueller continues to investigate whether there was collusion between the Trump campaign and Russians to interfere in the 2016 presidential election.
But Manafort is merely facing charges, and is jailed as he awaits trial.
Trump also falsely claimed that Manafort worked on the campaign for "49 days or something". Didn't know Manafort was the head of the Mob. His attorneys have argued that Manafort didn't do anything wrong and accused prosecutors of conjuring a "sinister plot" out of "innocuous" contacts with witnesses.
"I think that the Mueller investigation has been totally discredited", Trump said.
While out on bail, prosecutors say, Manaforttried to contact a pair of former journalists who'd worked on the lobbying, asking them to characterize their work as excluding the U.S.
On Friday afternoon, the president did question the revocation of Manafort's bail.
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.
Mr Manafort has pleaded not guilty to the witness tampering charges and will be detained in prison until his September trial. Kilimnik, who prosecutors say is living in Russian Federation, did not appear in court.
Kilimnik has been "assessed" by the Federal Bureau of Investigation to have ties with Russian intelligence, though the businessman denies this.
Mr Manafort has been indicted in both Washington and Virginia on a series of mostly financial-related charges, including conspiring to launder money and defraud the United States.