According to ABC News, prosecutors will announce a deal between the parties in court on Friday.
ABC News reported Wednesday that Manafort was seeking to avoid a deal that would involve him cooperating with government prosecutors in the Russian Federation investigation.
Regarding the Washington case, Manafort is accused of acting as an unregistered foreign agent, conspiring to launder money, and lying to the Federal Bureau of Investigation and Justice Department about the nature of his work.
The report of a tentative deal comes days before jury selection is expected to begin for Manafort's trial in D.C., which is set to kick off with opening statements on September 24. The jury there was deadlocked on 10 others.
The money laundering and foreign lobbying charges stem from consulting work Manafort did in Ukraine that predated the 2016 campaign.
Manafort has been held in jail for the last several months after prosecutors accused him of witness tampering.
Writing on Twitter on August 22, Trump said: "Unlike Michael Cohen, he refused to "break" - make up stories in order to get a 'deal". Trump has denied colluding with the Russians. "Such respect for a courageous man!"
Jackson said she would allow Downing to file additional information about his argument before issuing a ruling, but was inclined to bar such references because they weren't relevant to the charges against Manafort.
In the Virginia trial, prosecutors said Manafort hid from US tax authorities $16 million he earned as a political consultant in Ukraine to fund an opulent lifestyle that included purchasing multimillion-dollar properties, an ostrich skin jacket and other valuables.
A pretrial conference scheduled for Friday morning, rescheduled late Thursday night.
Before joining Trump's campaign, Manafort worked extensively for pro-Kremlin politicians and oligarchs in Ukraine.
Trump has repeatedly come to Manafort's defense.
Manafort's second trial is expected to delve deeper into Manafort's Russian connections including to Konstantin Kilimnik, a Ukrainian-Russian political consultant who was indicted along with Manafort and who Mueller's team has linked to Russian intelligence.