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Mr. Durham also developed an indirect method to impute political bias to law enforcement officials: comparing the Justice Department’s aggressive response to suspicions of links between Mr. Trump and Russia with its more cautious and skeptical reaction to various Clinton-related suspicions.

He examined an investigation into the Clinton Foundation’s finances in which the F.B.I.’s repeated requests for a subpoena were denied. He also scrutinized how the F.B.I. gave Mrs. Clinton a “defensive briefing” about suspicions that a foreign government might be trying to influence her campaign through donations, but did not inform Mr. Trump about suspicions that Russia might be conspiring with people associated with his campaign.

The Durham inquiry looked for evidence that Hillary Clinton’s 2016 presidential campaign had conspired to frame Donald J. Trump.

Dubious Intelligence
During the Russia investigation, the F.B.I. used claims from what turned out to be a dubious source, the Steele dossier — opposition research indirectly funded by the Clinton campaign — in its botched applications to wiretap a former Trump campaign aide.

The Durham investigation did something with parallels to that incident.

In Mr. Durham’s case, the dubious sources were memos, whose credibility the intelligence community doubted, written by Russian intelligence analysts and discussing purported conversations involving American victims of Russian hacking, according to people familiar with the matter.

The memos were part of a trove provided to the C.I.A. by a Dutch spy agency, which had infiltrated the servers of its Russian counterpart. The memos were said to make demonstrably inconsistent, inaccurate or exaggerated claims, and some U.S. analysts believed Russia may have deliberately seeded them with disinformation.

Mr. Durham wanted to use the memos, which included descriptions of Americans discussing a purported plan by Mrs. Clinton to attack Mr. Trump by linking him to Russia’s hacking and releasing in 2016 of Democratic emails, to pursue the theory that the Clinton campaign conspired to frame Mr. Trump. And in doing so, Mr. Durham sought to use the memos as justification to get access to the private communications of an American citizen.

One purported hacking victim identified in the memos was Leonard Benardo, the executive vice president of the Open Society Foundations, a pro-democracy organization whose Hungarian-born founder, Mr. Soros, has been vilified by the far right.

In 2017, The Washington Post reported that the Russian memos included a claim that Mr. Benardo and a Democratic member of Congress, Representative Debbie Wasserman Schultz of Florida, had discussed how Loretta E. Lynch, the Obama-era attorney general, had supposedly promised to keep the investigation into Mrs. Clinton’s emails from going too far.

But Mr. Benardo and Ms. Wasserman Schultz said they had never even met, let alone communicated about Mrs. Clinton’s emails.

Mr. Durham set out to prove that the memos described real conversations, according to people familiar with the matter. He sent a prosecutor on his team, Andrew DeFilippis, to ask Judge Beryl A. Howell, the chief judge of the Federal District Court in Washington, for an order allowing them to seize information about Mr. Benardo’s emails.

But Judge Howell decided that the Russian memo was too weak a basis to intrude on Mr. Benardo’s privacy, they said. Mr. Durham then personally appeared before her and urged her to reconsider, but she again ruled against him.

Rather than dropping the idea, Mr. Durham sidestepped Judge Howell’s ruling by invoking grand-jury power to demand documents and testimony directly from Mr. Soros’s foundation and Mr. Benardo about his emails, the people said. (It is unclear whether Mr. Durham served them with a subpoena or instead threatened to do so if they did not cooperate.)

Rather than fighting in court, the foundation and Mr. Benardo quietly complied, according to people familiar with the matter. But for Mr. Durham, the result appears to have been another dead end.

In a statement provided to The Times by Mr. Soros’s foundation, Mr. Benardo reiterated that he never met or corresponded with Ms. Wasserman Schultz, and said that “if such documentation exists, it’s of course made up.”

Internal Strife
As the focus of the Durham investigation shifted, cracks formed inside the team. Mr. Durham’s deputy, Ms. Dannehy, a longtime close colleague, increasingly argued with him in front of other prosecutors and F.B.I. agents about legal ethics.

Ms. Dannehy had independent standing as a respected prosecutor. In 2008, Attorney General Michael B. Mukasey assigned her to investigate whether to charge senior Bush administration officials with crimes related to a scandal over the firing of U.S. attorneys; she decided in 2010 that no charges were warranted.

Now, Ms. Dannehy complained to Mr. Durham about how Mr. Barr kept hinting darkly in public about the direction of their investigation. In April 2020, for example, he suggested to Fox News that officials could be prosecuted, saying that “the evidence shows that we are not dealing with just mistakes or sloppiness. There is something far more troubling here.”

Ms. Dannehy urged Mr. Durham to ask the attorney general to adhere to Justice Department policy and not discuss the investigation publicly. But Mr. Durham proved unwilling to challenge him.

The strains grew when Mr. Durham used grand jury powers to go after Mr. Benardo’s emails. Ms. Dannehy opposed that tactic and told colleagues that Mr. Durham had taken that step without telling her.

By summer 2020, with Election Day approaching, Mr. Barr pressed Mr. Durham to draft a potential interim report centered on the Clinton campaign and F.B.I. gullibility or willful blindness.

On Sept. 10, 2020, Ms. Dannehy discovered that other members of the team had written a draft report that Mr. Durham had not told her about, according to people briefed on their ensuing argument.

Ms. Dannehy erupted, according to people familiar with the matter. She told Mr. Durham that no report should be issued before the investigation was complete and especially not just before an election — and denounced the draft for taking disputed information at face value. She sent colleagues a memo detailing those concerns and resigned.

Two people close to Mr. Barr said he had pressed for the draft to evaluate what a report on preliminary findings would look like and what evidence would need to be declassified. But they insisted that he intended any release to come during the summer or after the Nov. 3 election — not soon before Election Day.

In any case, in late September 2020, about two weeks after Ms. Dannehy quit, someone leaked to a Fox Business personality that Mr. Durham would not issue any interim report, disappointing Trump supporters hoping for a pre-Election Day bombshell.

Stymied by the decision not to issue an interim Durham report, John Ratcliffe, Mr. Trump’s national intelligence director, tried another way to inject some of the same information into the campaign.

Over the objections of Gina Haspel, the C.I.A. director, Mr. Ratcliffe declassified nearly 1,000 pages of intelligence material before the election for Mr. Durham to use. Notably, in that fight, Mr. Barr sided with Ms. Haspel on one matter that is said to be particularly sensitive and that remained classified, according to two people familiar with the dispute.

Mr. Ratcliffe also disclosed in a letter to a senator that “Russian intelligence analysis” claimed that on July 26, 2016, Mrs. Clinton had approved a campaign plan to stir up a scandal tying Mr. Trump to Russia.

The letter acknowledged that officials did “not know the accuracy of this allegation or the extent to which the Russian intelligence analysis may reflect exaggeration or fabrication.” But it did not mention that there were many reasons that suspicions about the Trump campaign were arising in that period — like the diplomat’s tip, Mr. Trump’s flattery of President Vladimir V. Putin, his hiring of advisers with links to Russia, his financial ties to Russia and his call for Russia to hack Mrs. Clinton.

The disclosure infuriated Dutch intelligence officials, who had provided the memos under strictest confidence.

‘Fanning the Flames’
Late in the summer of 2021, Mr. Durham prepared to indict Michael Sussmann, a cybersecurity lawyer who had represented Democrats in their dealings with the F.B.I. about Russia’s hacking of their emails. Two prosecutors on Mr. Durham’s team — Anthony Scarpelli and Neeraj N. Patel — objected, according to people familiar with the matter.

Five years earlier, Mr. Sussmann had relayed a tip to the bureau about odd internet data that a group of data scientists contended could reflect hidden communications between the Trump Organization and Alfa Bank of Russia. The F.B.I., which by then had already launched its Russia investigation, briefly looked at the allegation but dismissed it.

Mr. Durham accused Mr. Sussmann of lying to an F.B.I. official by saying he was not conveying the tip for a client; the prosecutor maintained Mr. Sussmann was there in part for the Clinton campaign.

Mr. Scarpelli and Mr. Patel argued to Mr. Durham that the evidence was too thin to charge Mr. Sussmann and that such a case would not normally be prosecuted, people familiar with the matter said. Given the intense scrutiny it would receive, they also warned that an acquittal would undermine public faith in their investigation and federal law enforcement.

When Mr. Durham did not change course, Mr. Scarpelli quit in protest, people familiar with the matter said. Mr. Patel left soon after to take a different job. Both declined to comment.

The charge against Mr. Sussmann was narrow, but the Durham team used it to make public large amounts of information insinuating what Mr. Durham never charged: that Clinton campaign associates conspired to gin up an F.B.I. investigation into Mr. Trump based on a knowingly false allegation.

Trial testimony, however, showed that while Mrs. Clinton and her campaign manager hoped Mr. Sussmann would persuade reporters to write articles about Alfa Bank, they did not want him to take the information to the F.B.I. And prosecutors presented no evidence that he or campaign officials had believed the data scientists’ complex theory was false.

After Mr. Sussmann’s acquittal, Mr. Barr, by then out of office for more than a year, suggested that using the courts to advance a politically charged narrative was a goal in itself. Mr. Durham “accomplished something far more important” than a conviction, Mr. Barr told Fox News, asserting that the case had “crystallized the central role played by the Hillary campaign in launching as a dirty trick the whole Russiagate collusion narrative and fanning the flames of it.”

And he predicted that a subsequent trial, concerning a Russia analyst who was a researcher for the Steele dossier, would also “get the story out” and “further amplify these themes and the role the F.B.I. leadership played in this, which is increasingly looking fishy and inexplicable.”

That case involved Igor Danchenko, who had told the F.B.I. that the dossier exaggerated the credibility of gossip and speculation. Mr. Durham charged him with lying about two sources. He was acquitted, too.

The two failed cases are likely to be Mr. Durham’s last courtroom acts as a prosecutor. Bringing demonstrably weak cases stood in contrast to how he once talked about his prosecutorial philosophy.

James Farmer, a retired prosecutor who worked with Mr. Durham on several major investigations, recalled him as a neutral actor who said that if there were nothing to charge, they would not strain to prosecute. “That’s what I heard, time and again,” Mr. Farmer said.

Delivering the closing arguments in the Danchenko trial, Mr. Durham defended his investigation to the jury, denying that his appointment by Mr. Barr had been tainted by politics.

He asserted that Mr. Mueller had concluded “there’s no evidence of collusion here or conspiracy” — a formulation that echoed Mr. Trump’s distortion of the Russia investigation’s complex findings — and added: “Is it the wrong question to ask, well, then how did this get started? Respectfully, that’s not the case.”

The judge interrupted him: “You should finish up, Mr. Durham.”