Trump made his comments while the jurors deliberated behind closed doors on Friday morning, August 17.
The startling revelation came as the jury deliberated for its second day. "I don't feel right if I release their names", he said.
President Donald Trump has said that his former campaign manager is being "treated unfairly by our government" on Friday.
The judge added that he was being protected by United States marshals.
"I've received criticism and threats", he said, without elaborating.
Judge Ellis expressed his fears after a coalition of media organisations filed a motion requesting the names of jurors after the trial - as well as access to sealed transcripts of bench conferences that have occurred during the three-week trial.
In a note to the judge that said it wanted to go home at 5:30pm (local time), the jury asked for a definition of "reasonable doubt".
Westling attacked the government's contention that Manafort hid millions of dollars in offshore accounts to avoid USA taxes so he could fund the luxurious purchases. Ellis has been tough on the lawyers during the case, telling them to "rein in your facial expressions", urging prosecutors to speed up testimony and clashing with prosecutor Greg Andres during testimony by Manafort's former deputy.
It is unusual for a US president to comment about the character of a defendant in an ongoing trial and criticize the legal proceedings. "And I think it's very sad what they've done to Paul Manafort". "I think instead he's engaged in a campaign strategically created to communicate to some of his former friends like Paul Manafort, like Cohen, and in essence dangle pardons on Twitter".
Trump on Friday issued a fresh defense of Manafort and called him a "very good person".
Kevin Downing, Manafort's attorneny, told reporters he sees the continued deliberations as "a great sign for the defense".
Manafort's trial in federal court in Alexandria is the first stemming from Special Counsel Robert Mueller's 15-month-old investigation of Russia's role in the 2016 USA election.
Manafort's trial focuses entirely on alleged fraud and tax evasion, in a scheme prosecutors describe as an attempt to continue living a high-flying lifestyle after revenue from his consulting arrangements with the former head of Ukraine and other politicians dried up.
Gates had already pleaded guilty before Manafort's trial to helping him hide millions in income from US tax authorities and is awaiting sentencing. Prosecutors say he hid millions of dollars from the IRS in overseas bank accounts and then lied to banks to obtain multimillion dollar loans. Of Mr. Manafort, he said: "He happens to be a very good person".
A Manafort conviction would allow Democrats and Mueller's supporters to say ending the investigation would be premature. If convicted on all counts, he could face up to 10 years in prison.