President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Friday unleashed a barrage of early-morning tweets aimed at 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, blasting him as a conflicted and biased special counsel before Mueller is expected to file new documents in the Russia investigation.

The president called the investigation "a total Witch Hunt" and also sought to undermine the credibility of his own deputy attorney general, Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, who had been overseeing the probe, by arguing he is "totally conflicted."

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"Robert Mueller and Leakin’ Lyin’ James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE are Best Friends, just one of many Mueller Conflicts of Interest," Trump tweeted, referring to the man he fired as FBI director.

Robert Mueller and Leakin’ Lyin’ James Comey are Best Friends, just one of many Mueller Conflicts of Interest. And bye the way, wasn’t the woman in charge of prosecuting Jerome Corsi (who I do not know) in charge of “legal” at the corrupt Clinton Foundation? A total Witch Hunt... — Donald J. Trump (@realDonaldTrump) December 7, 2018

In a subsequent tweet, Trump asked if "Robert Mueller’s big time conflicts of interest [will] be listed at the top of his Republicans only Report."

He also argued that the Justice Department should investigate 2016 Democratic presidential nominee 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 Democratic National Committee and the Clinton Foundation.

"Will all of the substantial & many contributions made by the 17 Angry Democrats to the Campaign of Crooked Hillary be listed in top of Report. Will the people that worked for the Clinton Foundation be listed at the top of the Report?" he wrote.

....Will Robert Mueller’s big time conflicts of interest be listed at the top of his Republicans only Report. Will Andrew Weissman’s horrible and vicious prosecutorial past be listed in the Report. He wrongly destroyed people’s lives, took down great companies, only to be........ — Donald J. Trump (@realDonaldTrump) December 7, 2018

.....overturned, 9-0, in the United States Supreme Court. Doing same thing to people now. Will all of the substantial & many contributions made by the 17 Angry Democrats to the Campaign of Crooked Hillary be listed in top of Report. Will the people that worked for the Clinton.... — Donald J. Trump (@realDonaldTrump) December 7, 2018

....Foundation be listed at the top of the Report? Will the scathing document written about Lyin’ James Comey, by the man in charge of the case, Rod Rosenstein (who also signed the FISA Warrant), be a big part of the Report? Isn’t Rod therefore totally conflicted? Will all of.... — Donald J. Trump (@realDonaldTrump) December 7, 2018

The tweets come on what is expected to be a momentous day in Mueller's long-running investigation into possible collusion between the Trump campaign and Russia's efforts to interfere in the 2016 presidential election.

His office is expected to submit new filings later in the day detailing the status of cases against 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 and Trump's former personal lawyer Michael Cohen, both of whom pleaded guilty to separate charges.

Trump's tweets break a relatively brief period of silence on the Mueller probe during memorial services for former President George H.W. Bush, who died on Nov. 30.

For the second time in recent weeks, the president turned his fire on Rosenstein. He asked if the No. 2 Justice Department official's "scathing document written about Lyin’ James Comey" will be included in Mueller's final report on the probe.

Referring to a Foreign Intelligence Surveillance Act warrant signed by Rosenstein against former Trump campaign adviser Carter Page, Trump asked, "Isn’t Rod therefore totally conflicted?"

The debate over whether Rosenstein should recuse himself has long hung over the Russia probe, but the deputy attorney general said he has consulted with appropriate officials and that his position did not present a conflict.

Acting Attorney General Matthew Whitaker, a Trump loyalist, is now believed to be overseeing the probe in the wake of former Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE's ouster.

The president last week retweeted a photoshopped image showing several Trump opponents in jail, including Rosenstein, suggesting they should be locked up for treason.

The president also took aim at top Mueller deputy Andrew Weissmann, calling him a "horrible and vicious" prosecutor who "wrongly destroyed people’s lives, took down great companies."

Updated at 9:12 a.m.