In court documents, including an affidavit by Federal Bureau of Investigation agent Brock W. Domin, prosecutors with Special Counsel Robery S. Mueller III allege Manafort and his associate- referred to only as Person A - tried to contact the two witnesses by phone and through an encrypted messaging program.
The documents added that a longtime Manafort associate, referred to as "Person A", tried to contact D2 in the days after the superseding indictment was unsealed.
He has pleaded not guilty to all charges.
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Prosecutors are accusing Paul Manafort of making several attempts to tamper with witnesses.
Prosecutors said that was a violation of Mr. Manafort's release while he awaits trial.
In one call, the agent wrote, Manafort said he wanted to give the person a "heads-up about Hapsburg". But prosecutors say they worked with Manafort in organising a group of former European officials, known as the Hapsburg Group, who promoted Ukrainian interests in Europe as well as the US. The individual then hung up "because he was concerned about the outreach", according to the affidavit. Specifically, Manafort allegedly told Person D1 on February 26, "We should talk". I think, however, they were doing a number on Trump himself.
The group, informally called the "Hapsburg group", was secretly retained in 2012 by Manafort to take positions favorable to Ukraine, for whom Manafort was working, prosecutors charged.