Attorney General William Barr is pushing to reveal the principal conclusions of Special Counsel Robert Mueller’s report as early as Saturday night, an administration official familiar with the process tells Fox News.

“The Attorney General wants to get this out tonight,” the source said, noting that some procedural hurdles could delay Barr’s release.  “It will hit what is on everyone’s minds — no parsing of words, no games.”

A separate source told Fox News that Barr is likely to report on Mueller’s primary conclusions between 3 p.m. and 5 p.m. ET.

Mueller is not recommending any further indictments as part of his inquiry, which effectively ended Friday, according to a senior Justice Department official. Barr notified key congressional leaders in a letter Friday evening that Mueller finished his investigation, adding that a summary of the probe’s findings may be provided to lawmakers as soon as this weekend.

It will likely take longer for the facts supporting the conclusions to come out, Fox News is told, because there may be materials that are either classified, or subject to executive privilege in the factual material.

Fox News is told that Barr may run the conclusions past White House Counsel Pat Cipollone and Emmett Flood, who are currently in Mar-a-Lago, before they are released — but that Trump’s personal attorneys are unlikely to be notified.

Attorney General William Barr leaves his home in McLean, Va., on Friday, March 22, 2019. Special Counsel Robert Mueller is expected to present a report to the Justice Department any day now outlining the findings of his nearly two-year investigation into Russian election meddling, possible collusion with Trump campaign officials and possible obstruction of justice by Trump.

Attorney General William Barr leaves his home in McLean, Va., on Friday, March 22, 2019. Special Counsel Robert Mueller is expected to present a report to the Justice Department any day now outlining the findings of his nearly two-year investigation into Russian election meddling, possible collusion with Trump campaign officials and possible obstruction of justice by Trump. (AP)

Fox News has also confirmed that House Democrats, meanwhile, will conduct a conference call at 3 p.m. E.T. Saturday with “chairs of relevant committees” to discuss next steps regarding the Mueller report and messaging. New York Rep. Hakeem Jeffries will host as Caucus Chair.

Some advocacy groups, however, have made clear they aren’t keen on waiting. A nonprofit organization on Friday night filed the first known Freedom of Information Act (FOIA) lawsuit seeking the immediate and total public disclosure of Mueller’s completed report, echoing bipartisan calls for transparency following his nearly two-year probe into whether the Trump campaign illegally colluded with Russia.

The Electronic Privacy Information Center (EPIC) wrote in an emergency complaint filed in a Washington, D.C., federal district court that the “public has a right to know the full scope of Russian interference in the 2016 United States presidential election and whether the president of the United States played any role in such interference.”

The lawsuit continued: “The public also has a right to know whether the president unlawfully obstructed any investigation into Russian election interference or related matters. The requested records are vital to the public’s understanding of these issues and to the integrity of the political system of the United States.”

The delivery of the Mueller report, which a DOJ official called “comprehensive,” does mean the investigation has concluded without any public charges of a criminal conspiracy between the campaign and Russia or of obstruction by the president.

That’s good news for a handful of Trump associates and family members dogged by speculation of possible wrongdoing. They include Donald Trump Jr., who had a role in arranging a Trump Tower meeting at the height of the 2016 election campaign with a Kremlin-linked lawyer, and Trump’s son-in-law, Jared Kushner, who was interviewed at least twice by Mueller’s prosecutors.

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Still, some key details remain unanswered, EPIC said, prompting its litigation. EPIC first filed a FOIA request seeking access to Mueller-related documents in November 2018 and requested expedited processing, citing the “overwhelming” public interest in the case. But the Justice Department, on behalf of Mueller’s office, wrote back that EPIC could effectively take a hike because the DOJ could not “identify a particular urgency to inform the public about an actual or alleged federal government activity.”

Special Counsel Robert Mueller arrives at his office building, Thursday, March 21, 2019, in Washington. Mueller has concluded his investigation into Russian election interference and possible coordination with associates of President Donald Trump. (AP Photo/Andrew Harnik)

Special Counsel Robert Mueller arrives at his office building, Thursday, March 21, 2019, in Washington. Mueller has concluded his investigation into Russian election interference and possible coordination with associates of President Donald Trump. (AP Photo/Andrew Harnik)

“Today—March 22, 2019—is the 92nd working day since the DOJ received EPIC’s FOIA request,” the complaint stated, charging that “the DOJ has failed to make a determination regarding EPIC’s FOIA request within the time period allowed” by federal law.

EPIC’s lawsuit demanded not only the full release of the Mueller report but also any supporting exhibits and documentation relied upon by Mueller’s team, including “all drafts, outlines, exhibits, and supporting materials associated with any actual or planned explanation for any investigative or prosecutorial step.”

House Democrats, meanwhile, have somewhat downplayed the Mueller probe and suggested that the left-leaning lawmakers themselves might take on the job of trying to prove collusion, not ruling out the possibility of Mueller being asked or subpoenaed to testify before congressional committees.

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“If the Justice Department doesn’t release the whole report or tries to keep parts of it secret, we will certainly subpoena the parts of the report and we will reserve the right to call Mueller to testify before the committee or to subpoena him,” House Judiciary Committee Chairman Jerry Nadler, D-N.Y., said in a statement.

While the Mueller probe’s conclusions are not yet known, the investigation already has led to indictments, convictions or guilty pleas for nearly three dozen people and three companies. All told, Mueller charged 34 people, including the president’s former campaign chairman, Paul Manafort; his first national security adviser, Michael Flynn; and three Russian companies. Twenty-five Russians were indicted on charges related to election interference, accused either of hacking Democratic email accounts during the campaign or of orchestrating a social media campaign that spread disinformation on the internet.

President Donald Trump talks with reporters before boarding Marine One on the South Lawn of the White House, Friday, March 22, 2019, in Washington. Special counsel Robert Mueller on Friday turned over his long-awaited final report on the contentious Russia investigation, ending a probe that has cast a dark shadow over Donald Trump's presidency with no new charges but launching a fresh wave of political battles over the still-confidential findings. 

President Donald Trump talks with reporters before boarding Marine One on the South Lawn of the White House, Friday, March 22, 2019, in Washington. Special counsel Robert Mueller on Friday turned over his long-awaited final report on the contentious Russia investigation, ending a probe that has cast a dark shadow over Donald Trump’s presidency with no new charges but launching a fresh wave of political battles over the still-confidential findings.  (AP)

Five Trump aides pleaded guilty and agreed to cooperate with Mueller, and a sixth, longtime confidant Roger Stone, is awaiting trial on charges that he lied to Congress and engaged in witness tampering.

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Despite all that prosecutorial activity, though, no Americans have been charged with improperly conspiring with Russia. In a series of posts on Twitter on Friday, journalist Glenn Greenwald — who also called for the release of the Mueller report — repeatedly emphasized that point, and condemned pundits for hyping the Mueller report irresponsibly for nearly two years.

“It’s truly fascinating to watch Dems grapple with the fact that Mueller finished his work without indicting a single American for conspiring with Russia over the election: everything from “nobody has read his report!” (irrelevant to that fact) to ‘sealed indictments!’ (unhinged).” Greenwald wrote.

In another post, he criticized media outlets for promoting the anti-Trump rhetoric of partisan commentators like ex-CIA Director John Brennan — an Obama appointee whose security clearance was revoked last year because, the Trump administration said, he was using it to lend credence to political attacks.

“You can’t blame MSNBC viewers for being confused,” Greenwald continued. “They largely kept dissenters from their Trump/Russia spy tale off the air for 2 years. As recently as 2 weeks ago, they had @JohnBrennan strongly suggesting Mueller would indict Trump family members on collusion as his last act. … Oh gosh – turns out that if you hire ex-CIA Directors to be ‘news analysts,’ they’ll abuse our airwaves to disseminate self-serving disinformation.”

A copy of a letter from Attorney General William Barr advising Congress that Special Counsel Robert Mueller has concluded his investigation, is shown Friday, March 22, 2019 in Washington. Robert Mueller on Friday turned over his long-awaited final report on the contentious Russia investigation that has cast a dark shadow over Donald Trump's presidency, entangled Trump's family and resulted in criminal charges against some of the president's closest associates. 

A copy of a letter from Attorney General William Barr advising Congress that Special Counsel Robert Mueller has concluded his investigation, is shown Friday, March 22, 2019 in Washington. Robert Mueller on Friday turned over his long-awaited final report on the contentious Russia investigation that has cast a dark shadow over Donald Trump’s presidency, entangled Trump’s family and resulted in criminal charges against some of the president’s closest associates.  (AP)

He concluded: “How – if you’re an MSNBC viewer (or consumer of similar online content) – can you not be angry & disoriented having been fed utter [bulls–t] like this for 2 straight years with basically no dissent allowed? Just listen to what they were telling you to believe & how false it was.”

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Meanwhile, House Speaker Nancy Pelosi and Senate Minority Leader Chuck Schumer declared it “imperative” to make the full report public, a call echoed by several Democrats vying to challenge Trump in 2020.

“The American people have a right to the truth,” Schumer and Pelosi said in a joint statement.

Democrats also expressed concern that Trump would try to get a “sneak preview” of the findings.

“The White House must not be allowed to interfere in decisions about what parts of those findings or evidence are made public,” they said in a joint statement.

A presidential helicopter takes off in a practice run as the White House is reflected in a puddle, Friday March 22, 2019, in Washington, amid news that special counsel Robert Mueller has concluded his investigation into Russian election interference and possible coordination with associates of President Donald Trump. 

A presidential helicopter takes off in a practice run as the White House is reflected in a puddle, Friday March 22, 2019, in Washington, amid news that special counsel Robert Mueller has concluded his investigation into Russian election interference and possible coordination with associates of President Donald Trump.  (AP)

It was not clear whether Trump would have early access to Mueller’s findings. Spokeswoman Sarah Sanders suggested the White House would not interfere, saying, “We look forward to the process taking its course.” But Trump’s personal attorney, Rudy Giuliani, told The Associated Press Friday that the legal team would seek to get “an early look” before they were made public.

Giuliani said it was “appropriate” for the White House to be able “to review matters of executive privilege.” He said had received no assurances from the Department of Justice on that front. He later softened his stance, saying the decision was “up to DOJ and we are confident it will be handled properly.”

The White House did receive a brief heads-up on the report’s arrival Friday. Barr’s chief of staff called White House Counsel Emmet Flood Friday about 20 minutes before sending the letter went to the Republican and Democratic leaders of the Senate and House Judiciary committees.

Fox News’ Ed Henry, Mike Emanuel, Brooke Singman, Jake Gibson, and The Associated Press contributed to this report.