Two Justice Department prosecutors assigned to 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 are leaving the office to return to previous postings.

Peter Carr, a spokesman for the special counsel's office, confirmed in an email to The Hill that Kyle Freeny and Brandon Van Grack are leaving the probe.

The two prosecutors had worked on the criminal cases involving 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, Carr added.

Van Grack recently left the probe to return to the agency's national security division, while Freeny will remain on until mid-October before returning to the agency's criminal division.

Carr said Van Grack will continue to contribute to the special counsel investigation "on specific pending matters that were assigned to him during his detail."

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The spokesman told CNN that the prosecutors' return to previous postings were not a result of disciplinary measures.

The investigation reached a new milestone last month with an agreement from Manafort to plead guilty ahead of a second trial in Washington, D.C., to numerous criminal charges surrounding his lobbying work in Ukraine and subsequent efforts to launder money through foreign bank accounts.

Manafort is set to be sentenced later this year as part of his trial in Virginia, where a jury convicted him on eight counts. Former national security adviser Michael Flynn, who pleaded guilty in 2017 to lying to the FBI about his contacts with Russian Ambassador Sergey Kislyak during the presidential transition, is also slated to be sentenced later this year.

BuzzFeed News reported in late September that Mueller's team is still investigating millions of dollars in payments made between two organizers of the June 2016 Trump Tower meeting between Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, top Trump campaign executives and a Russian lawyer who promised damaging information on Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE.

The president has frequently lashed out against the ongoing investigation, which he has characterized as a "witch hunt" conjured by "angry Democrats" to undermine his presidency.