Colleagues of Dannehy indicate that she is not a supporter of Trump and has become increasingly concerned in the past weeks due to vast pressure from Barr to rapidly produce the results that were not ready for publication. He joined the team nearly a year and a half ago.
According to the Courant, Danny, who is not a Trump supporter, became concerned in recent weeks by what she believed was pressure from Barr - who appointed Durham - to produce results before the election.
In the absence of official information, Democrats eager to accuse Trump and Attorney General William Barr of "corruption" seized on the narrative that she was uncomfortable by "pressure" on the investigation.
Her departure could complicate the final stretch of an investigation already slowed by the coronavirus pandemic but eagerly anticipated by President Donald Trump and his supporters to uncover what they see as wrongdoing within the FBI during the Russian Federation investigation.
Fox News' Brooke Singman contributed to the report.
The inquiry has not yet brought the results that Trump supporters had been hoping for
Democratic Representative Adam Schiff, the House Intelligence Committee chairman, said releasing findings before November 3 would violate a Justice Department policy against making any moves that could impact an election.
Durham has never even acknowledged that Dannehy was in Washington working for him, had no immediate comment on the resignation.
The Durham investigation produced its first public result in August with the arrest of former FBI lawyer Kevin Clinesmith, who pleaded guilty to falsifying a document to justify surveillance of a former Trump campaign adviser as part of the 2016 investigation.
Justice Department Inspector General Michael Horowitz uncovered the doctored email and in December released a scathing report documenting 17 "basic and fundamental" errors and omissions in Federal Bureau of Investigation surveillance warrant applications.
It is not clear if Durham will be able to conclude his work before the election, though Barr has not ruled out the possibility of additional criminal charges. The highly regarded prosecutor informed colleagues of her resignation. In 2008, she was assigned to Washington to investigate whether prosecutors in the President George W. Bush justice department had been fired for political reasons.