WASHINGTON  - Special counsel Robert Mueller closed his long and contentious Russia investigation with no new charges, ending the probe that has cast a dark shadow over Donald Trump’s presidency. The Justice Department was expected to release the main findings as soon as Saturday. Even with the details still under wraps, the end Friday of the 22-month probe without additional indictments by Mueller was welcome news to some in Trump’s orbit who had feared a final round of charges could ensnare more Trump associates, including members of the president’s family.

For now, the report is accessible to only a handful of Justice Department officials while Attorney General William Barr prepared to release the “principal findings” soon.

The Justice Department said the report was delivered by a security officer Friday afternoon to the office of Deputy Attorney General Rod Rosenstein, and then it went to Barr. Word of the delivery triggered reactions across Washington, including Democrats’ demands that it be quickly released to the public and Republicans’ contentions that it ended two years of wasted time and money.

The next step is up to Barr, who is charged with writing his own account of Mueller’s findings and sending it to Congress. In a letter to lawmakers, he declared he was committed to transparency and speed. He said he could provide details as soon as this weekend.

The White House sought to keep some distance from the report, saying it had not seen or been briefed on the document. Trump, surrounded by advisers and political supporters at his resort in Florida, stayed uncharacteristically quiet on Twitter.

With no details released at this point, it’s not known whether Mueller’s report answers the core questions of his investigation: Did Trump’s campaign collude with the Kremlin to sway the 2016 presidential election in favor of the celebrity businessman? Also, did Trump take steps later, including by firing his FBI director, to obstruct the probe?

But the delivery of the report 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. A Justice Department official confirmed that Mueller was not recommending any further indictments.

That person, who described the document as “comprehensive,” was not authorized to discuss the probe and asked for anonymity.

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. It wasn’t immediately clear whether Mueller might have referred additional investigations to the Justice Department.

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. 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. It’s unclear what steps Mueller might take if he uncovered what he believes to be criminal wrongdoing by Trump, in light of Justice Department legal opinions that have held that sitting presidents may not be indicted.

In his letter to lawmakers, Barr noted the Justice Department had not denied any request from the special counsel, something Barr would have been required to disclose to ensure there was no political inference. Trump was never interviewed in person, but submitted answers to questions in writing.

The mere delivery of the confidential findings set off swift, full-throated demands from Democrats for full release of Mueller’s report and the supporting evidence collected during the sweeping probe. As Mueller’s probe has wound down, Democrats have increasingly shifted their focus to their own investigations, ensuring the special counsel’s would not be the last word on the matter.

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.