WASHINGTON — When the Trump administration assigned a prosecutor in 2019 to scour the Russia investigation for any wrongdoing, President Donald J. Trump stoked expectations among his supporters that the inquiry would find a “deep state” conspiracy against him.
Three years later, the team led by the special counsel, John H. Durham, on Monday will open the first trial in a case their investigation developed, bringing before a jury the claims and counterclaims that surrounded the 2016 presidential campaign. But rather than showing wrongdoing by the F.B.I., it is a case that portrays the bureau as a victim.
The trial centers on whether Michael Sussmann, a cybersecurity lawyer with ties to Democrats, lied to the F.B.I. in September 2016, when he relayed suspicions about possible cyberconnections between Mr. Trump and Russia. The F.B.I. looked into the matter, which involved a server for the Kremlin-linked Alfa Bank, and decided it was unsubstantiated.
In setting up the meeting, Mr. Sussmann had told an F.B.I. official that he was not acting on behalf of any client. Prosecutors contend he concealed that a technology executive and the Hillary Clinton campaign were his clients to make the allegations seem more credible.
The defense argues that Mr. Sussmann was not acting on their behalf at the meeting. The F.B.I. was aware that he had represented Democrats on matters related to Russia’s hacking of their servers, and subsequent communications made clear that he also had a client who had played a role in developing the data analysis concerning Alfa Bank, his lawyers say.
While the charge against Mr. Sussmann is narrow, Mr. Durham has used it to release large amounts of information to insinuate that there was a broad conspiracy involving the Clinton campaign to essentially frame Mr. Trump for colluding with Russia.
That insinuation also hangs over the other case Mr. Durham has developed, which is set to go to trial later this year. It accuses a researcher for the so-called Steele dossier — a since-discredited compendium of opposition research about purported links between Mr. Trump and Russia — of lying to the F.B.I. about some of his sources.
Both cases have connections with the law firm Perkins Coie, where Mr. Sussmann worked then. One of his partners, Marc Elias, was the general counsel of the Clinton campaign and had commissioned opposition research that led to the Steele dossier.
The Alfa Bank allegations and the Steele dossier were largely tangential to the official investigation into whether there was collusion between Russia and the Trump campaign. F.B.I. officials had opened that investigation on other grounds, and the special counsel who completed the inquiry, Robert S. Mueller III, did not rely on either in his final report.
(His report detailed “numerous links between the Russian government and the Trump campaign,” but he did not charge any Trump associate with a criminal conspiracy with Russia.)
But supporters of Mr. Trump have rallied around Mr. Durham’s narrative, which resonates with Mr. Trump’s oft-repeated claim that the entire Russia investigation was a “hoax.”
Defense lawyers for Mr. Sussmann have also rejected prosecutors’ broader insinuations about the constellation of events that led to his indictment, accusing the Durham team of fueling politicized conspiracy theories.
Against that backdrop, much of the pretrial jostling has centered on how far afield prosecutors may roam from the core accusation. Judge Christopher Cooper of the Federal District Court for the District of Columbia, an Obama appointee, has imposed some limits on what Mr. Durham’s team may present to the jury.
Through his court filings, Mr. Durham and his team have signaled that they suspect that the Alfa Bank data or analysis may have been faked, even though they were unable to prove it.
But the judge barred Mr. Durham from presenting evidence or arguments along those lines, saying that unless there was proof Mr. Sussmann…
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