Prosecutors in Paul Manafort's financial fraud trial say they expect to rest their case on Friday.

On Thursday, prosecutors returned to the nuts and bolts of their case against the former Trump campaign chairman as they sought to show he obtained millions of dollars in bank loans under false pretenses.

Attorneys for special counsel Robert Mueller also got a rare, and narrow, acknowledgment from U.S. District Judge T.S. Ellis III in Alexandria, Virginia, that he likely erred when he angrily confronted them over whether he had allowed a witness to watch the trial.

Thursday's testimony was devoid of some of the drama of recent days, when star witness Rick Gates was confronted about embezzling hundreds of thousands of dollars from Manafort and was forced to admit to an extramarital affair.

Mueller is investigating Russian election interference and any possible coordination with Trump associates.

Meanwhile, the cross-examination of Manafort's protégé ended after the defense renewed its attack on Rick Gates' credibility.

In three days of testimony, Gates acknowledged cheating on his wife, stealing from Manafort and initially lying to special counsel Robert Mueller's team investigating Russian election meddling.

Following Gates' testimony, prosecutors resumed trying to make their case for financial fraud by Manafort through documentary evidence to demonstrate his control of offshore bank accounts containing millions of dollars not reported to the IRS as required by U.S. law.

An IRS agent, Michael Welch, testified that Manafort didn't report at least $16 million on his tax returns between 2010 and 2014. He also said Manafort should have reported multiple foreign bank accounts to the IRS in those years.

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