The long-awaited report was released Thursday afternoon, spanning almost 600 pages and scrutinizing the actions of numerous figures who played a key role in the Justice Department and FBI's investigation.
The report from Inspector General Michael Horowitz said the "damage caused by their actions extends far beyond the scope of the [Clinton e-mail] investigation and goes to the heart of the FBI's reputation for neutral fact-finding and political independence".
Comey, days before the election, announced he would revisit the probe after the discovery of new emails, a move that the Clinton camp has blamed for her loss.
Horowitz's report investigated Comey and former Attorney General Loretta Lynch's handling of the investigation which started with Hillary Clinton's use of a private email server but expanded to touch on other politically sensitive decisions. The inspector general also reviewed Comey's decision to inform Congress days before the election that the FBI was reopening the investigation into Clinton.
In October 2016, less than two weeks before election day, Mr Comey sent members of Congress a letter disclosing that the probe was being reopened after new emails were found on the computer of the husband of top Clinton aide Huma Abedin.
"The report revealed that Lisa Page, an Federal Bureau of Investigation lawyer and his lover, had texted him on August 8, 2016: "[Trump's] not ever going to become president right?
Consider taking steps to improve the retention and monitoring of text messages department-wide.
The IG report also looked at counterintelligence officer Peter Strzok and agent Lisa Page.
In Horowitz's report he stated that Strzok's texts and actions are "not only indicative of a biased state of mind but, even more seriously, implies a willingness to take official action to impact the presidential candidate's electoral prospects".
"I was not certain I was right about those things at the time".
The inquiry has focused on whether public statements made by Comey about Democrat Mrs Clinton's use of a private email server while she was secretary of state were based on "improper considerations".
President Trump has looked to the report to provide a fresh line of attack against Comey and his deputy, Andrew McCabe, as he claims that a politically tainted bureau tried to undermine his campaign and, through the later Russian Federation investigation, his presidency.
Uh huh. And what about Comey's decision not to accuse Clinton of "gross negligence"?
Concerned about the "appearance that former President Clinton was influencing" the probe, Lynch began talking to her staff the next morning about possibly recusing herself from overseeing the investigation, according to the report. "The two doors were actually labeled 'follow policy/practice" and 'depart from policy/practice.'" Still, "we did not find that these decisions were the result of political bias on Comey's part".
Moreover, the treatment afforded to former Secretary Clinton and other potential subjects and targets was starkly different from the FBI's investigation into Trump campaign officials.
More recently, the President has signaled a hope that the inspector general's report will vindicate his instincts on Comey.
"That decision really fell to me, ultimately on the Comey matter", Sessions said, saying it was "the right move".
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