Interviews by The Times with more than a dozen current and former officials have revealed an array of previously unreported episodes that show how the Durham inquiry became roiled by internal dissent and ethical disputes as it went unsuccessfully down one path after another even as Mr. Trump and Mr. Barr promoted a misleading narrative of its progress.

Mr. Barr and Mr. Durham never disclosed that their inquiry expanded in the fall of 2019, based on a tip from Italian officials, to include a criminal investigation into suspicious financial dealings related to Mr. Trump. The specifics of the tip and how they handled the investigation remain unclear, but Mr. Durham brought no charges over it.

Mr. Durham used Russian intelligence memos — suspected by other U.S. officials of containing disinformation — to gain access to emails of an aide to George Soros, the financier and philanthropist who is a favorite target of the American right and Russian state media. Mr. Durham used grand jury powers to keep pursuing the emails even after a judge twice rejected his request for access to them. The emails yielded no evidence that Mr. Durham has cited in any case he pursued.

There were deeper internal fractures on the Durham team than previously known. The publicly unexplained resignation in 2020 of his No. 2 and longtime aide, Nora R. Dannehy, was the culmination of a series of disputes between them over prosecutorial ethics. A year later, two more prosecutors strongly objected to plans to indict a lawyer with ties to Hillary Clinton’s 2016 campaign based on evidence they warned was too flimsy, and one left the team in protest of Mr. Durham’s decision to proceed anyway. (A jury swiftly acquitted the lawyer.)

[Well, *maybe*. I’m more skeptical about leaks from these kinds of operations than ever. But given the history of special counsels, I wouldn’t be surprised if it turns out to be a bust. — Ed]