Washington is on edge as it awaits the highly anticipated release of 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 report on Thursday, the findings of which could ignite a political firestorm.

Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE isn't delivering the report to Congress until 11 a.m. — after he and 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 hold a 9:30 a.m. press conference to discuss the findings.

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The move drew howls of protest from Democrats on Wednesday night, especially after The New York Times reported that White House lawyers and Department of Justice officials have already discussed details of Mueller's conclusions.

Democrats say Barr has acted as an agent of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE in his role overseeing the release of the report, which will mark the culmination of one of the most-watched probes in recent political history.

Barr has consistently argued he had to wait to release the report in order to redact any grand jury material, classified information and details pertaining to ongoing investigations.

Democrats are hoping to use the report to bolster their sprawling probes into Trump’s administration, businesses and campaign.

But if the roughly 400-page document contains little evidence implicating Trump on obstruction of justice, the probes are certain to lose steam and thwart their plans to dig into every facet of the administration heading into 2020.

Republicans have already celebrated the principal findings of Mueller’s report — as provided by Barr — which found no evidence of collusion or coordination between the Trump campaign and Russia.

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But GOP lawmakers are cautiously eyeing whether Thursday’s release will reveal damaging information about the president, which could cause a lasting migraine for both the White House and Republicans in their 2020 election efforts.

Trump and his conservative allies have repeatedly sought to undercut the credibility of the probe, with the president this week calling it “the greatest scam in political history” and a complete “fabrication.”

Democrats are focusing their firepower on Barr, who sparked their fury after he decided, along with Rosenstein, that there was not sufficient evidence to charge the president with obstruction of justice, even though Mueller declined to make a call on the matter.

Democrats have since questioned whether Barr can be a fair arbiter of justice.

“Bill Barr is acting like a federally paid public defender for the president of the United States,” said Rep. Jamie Raskin Jamin (Jamie) Ben RaskinOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security House panel pulls Powell into partisan battles over pandemic Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (D-Md.), a member of the House Judiciary Committee.

Fellow committee member Rep. David Cicilline David Nicola CicillineClark rolls out endorsements in assistant Speaker race Races heat up for House leadership posts The folly of Cicilline's 'Glass-Steagall for Tech' MORE (D-R.I.) said, “The president has made it very clear he was looking for a Roy Cohn — he got him.”

Multiple Democrats have voiced concern that Barr will strategically and unnecessarily redact information in the Mueller report to protect Trump. House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) has threatened to subpoena the full report and its underlying evidence if he considers it to be heavily redacted.

Barr says he will follow the special counsel regulations, which limit him from revealing certain information, such as grand jury material. He also says he will black out classified information, details impacting ongoing investigations, and “information that would unduly infringe on the personal privacy and reputational interests of peripheral third parties.”

Democrats say that approach is unacceptable. Earlier this month, the House Judiciary Committee voted along party lines to authorize a subpoena to obtain the entire report and all of the underlying evidence collected by Mueller, with Democrats vowing to battle the Justice Department for all the information Democrats say is key to conducting their oversight probes.

A spokesman for the Judiciary panel told The Hill on Wednesday that Nadler could issue a subpoena “very quickly” after receiving the report, but that all depends on a review of the report once the committee receives it.

Federal prosecutors revealed in a court filing Wednesday that some lawmakers will be able to view a special copy of the Mueller report "without certain redactions."

Barr is expected to testify before the committee on May 2, giving Democrats another opportunity to press him for more information about the probe.

Congressional Democrats for months have pointed to a 19-page memo authored by Barr last year, while he was in private practice, arguing that Trump could not be charged with obstruction in the firing of former FBI Director 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 because the president has the authority to choose the members of his administration.

That memo, coupled with Barr’s decision last month to say no obstruction occurred, ramped up accusations from Democrats that Barr is nothing more than a Trump loyalist who was auditioning for the role before he was nominated.

“He is not acting like the chief law enforcement officer of the United States who is interested in the fair and impartial administration of justice,” Raskin told The Hill. “And all of it comes out of that 19-page memo he wrote as a job application.”

Democrats have indicated in recent weeks that they have no plans to halt their investigations into Trump after the Mueller report is released.

“The Mueller report dealt with a targeted investigation into a narrow set of questions about the 2016 campaign,” Raskin said. “It doesn’t deal with any of the corruption or abuses of power that we have seen since Donald Trump took office.”

The House Intelligence and Financial Services committees recently amped up their probes into Trump’s finances — which they say Mueller did not thoroughly examine given the scope of his probe — by issuing subpoenas to Deutsche Bank and others.

"At the end of the day, the Mueller investigation was principally focused as a criminal investigation. That's not the purpose of the House Intelligence Committee's work," Rep. Denny Heck Dennis (Denny) Lynn HeckExclusive: Guccifer 2.0 hacked memos expand on Pennsylvania House races Heck enjoys second political wind Incoming lawmaker feeling a bit overwhelmed MORE (D-Wash.), a member of the committee, told CNN's Wolf Blitzer on Tuesday.

Meanwhile, the House Oversight and Reform Committee ratcheted up its efforts by subpoenaing Trump’s accounting firm, Mazars USA, in an effort to examine whether the president misrepresented his net worth.

And the House Ways and Means Committee is pushing for six years of Trump's personal and business tax returns in what is expected to become a prolonged court battle.

On the other side of the aisle, Republicans have been touting a pre-report message that emphasizes the principal findings Barr provided Congress last month: no collusion, no obstruction. They have also signaled plans to amplify those core conclusions regardless of what the report says on Thursday.

“The Mueller report will confirm there was no collusion, but take it to the bank: Democrats will double down. They’ll continue selling this hoax, even when none of the classified evidence they’ve been promising appears to exist,” Freedom Caucus Chairman Mark Meadows Mark Randall MeadowsThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November House moves toward spending vote after bipartisan talks House Democrats mull delay on spending bill vote MORE (R-N.C.) tweeted Wednesday. “Treat their spin with the skepticism it deserves.”

Republicans are keenly aware that no matter what is in the public report, Democrats are going to use it to attack the president, said GOP strategist Ford O’Connell.

“The White House knows there is nothing they can say or do that will satisfy the Democratic or media beast when it comes to the Mueller report. They already noticed this because the Democrats have moved from a Trump-Russia conspiracy to a Trump-Barr conspiracy,” O’Connell said.

Republicans have also signaled they intend to leverage any momentum from the Mueller report to look into how the investigation began in the first place, with a sharp focus on those who launched the counterintelligence probe into the Trump campaign and whether the top members of the FBI and Justice Department harbored an anti-Trump bias while they led the Russia investigation.

Trump has called for as much over the weekend, demanding in a tweet: “INVESTIGATE THE INVESTIGATORS!”

And while the contents of the Mueller report are unknown on the eve of its release, one thing is clear: Democrats and Republicans will be sure to seize on the findings to bolster their calls for justice and transparency.