Attorneys working on the upcoming Washington, D.C., trial of former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE expect that trial to last three weeks and explore more deeply his lobbying work in Ukraine.

The Washington Post reports that prosecutors have entered 1,500 possible exhibits into evidence and say they will closely examine the extent of Manafort's lobbying for pro-Russia causes in Ukraine.

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Manafort's trial, set to begin Sept. 17, is his second after receiving eight guilty verdicts on counts he faced in a Virginia trial that ended this week. The trial resulted in a mistrial on 10 additional verdicts.

The former Trump aide, 69, pleaded not guilty to the charges, which stem from accusations that Manafort hid millions made for lobbying work in foreign bank accounts which he used to fund a lavish lifestyle in the U.S. The charges resulted from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's ongoing investigation.

A former business associate testified during the trial that Manafort personally directed associates to falsify documents to make some of the income appear as a business loan.

Manafort remains in jail awaiting his second trial after a judge ordered him into custody for allegedly violating the terms of his bail agreement.

President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE has frequently characterized the ongoing special counsel investigation into election interference as a "witch hunt" and lamented Manafort's treatment by prosecutors.

“He happens to be a very good person and it happens to be very sad what they’ve done to Paul Manafort,” the president told reporters last week.

This post was updated at 10:02 a.m. to correct the start date of Manafort's D.C. trial.