A trial is scheduled for July 10.
The bearded man stood outside a Virginia courthouse to slam Manafort, who is accused of hiding tens of millions of dollars he earned through consulting work in the Ukraine from the Internal Revenue Service.
Mr. Manafort has been indicted twice on separate charges in Washington, D.C. He has pleaded not guilty to those charges as well.
Manafort entered a plea of not guilty to the charges, through his attorney Kevin Downing. But prosecutors say they were required to bring these charges to Virginia because they lacked venue in the nation's capital.
In May 2017, Mueller was appointed to investigate Russia's alleged interference in the 2016 presidential election. The charges include preparing false tax returns, bank fraud, conspiracy to commit bank fraud and failure to disclose income from foreign sources.
Iran - Visit by Mr Jean-Yves le Drian (5 March 2018)
Le Drian arrived in Tehran on Monday for talks with Iranian officials on mutual ties as well as regional and worldwide issues. Trump has threatened to pull out of the deal unless Congress and European allies help "fix" it with a follow-up agreement.
In Washington, he faces counts of conspiracy to launder more than $30 million (U.S.), making false statements, failing to follow lobbying disclosure laws and working as an unregistered foreign agent.
At a court appearance in Washington, D.C. on February 28, Judge Amy Berman Jackson chastised President Trump's former campaign chairman, saying, "I want to reiterate, Mr. Manafort, that the order that I issued, over no one's objection, does not just apply to Mr".
He is also facing a second case in federal court in Virginia, where he pleaded not guilty to tax and fraud charges.
Former Trump campaign chairman Paul Manafort arrives at the Albert V. Bryan U.S. Courthouse for an arraignment hearing on March 8, 2018, in Alexandria, Va.
Judge Ellis, who has been on the bench for 31 years, alternately cracked jokes and pressed lawyers for Manafort and Mueller's office on their legal positions.