One of the most damming pieces of evidence was a never before seen text message from embattled FBI Special Agent Peter Strzok to his paramour former FBI Attorney Lisa Page where he suggests that he will not allow Trump to become president.
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. Although many of those text messages have since been made public and are unquestionably disturbing, none were almost as hostile as the promise by Strzok to "stop" Trump from becoming president - which, conveniently, was never included in the multiple leaks made to the press about this investigation over the past several months.
Strzok and then-FBI attorney Lisa Page were singled out and chastised for their anti-Trump texts amid the Clinton and Russian Federation probes.
"Tomorrow, Mueller should be suspended and honest people should be brought in, impartial people to investigate these people like Strzok", Giuliani said. Mr Mueller removed Strzok from his team after Horowitz disclosed the texts to him. He was also "responsible for supervising the investigation on a daily basis", according to the report. The inspector general has previously unearthed an exchange of pro-Clinton, anti-Trump texts between the two.
Comey and the Federal Bureau of Investigation were heavily faulted, with Comey, a strong critic of Trump, seen as repeatedly skirting agency rules and procedures, and two agents under him revealing in personal messages a "willingness to take official action to impact" Trump's election chances.
The report says "we find it extraordinary that".
Some of what Horowitz discovered has already been made public.
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But Joshua Gordon, director of the National Institute of Mental Health , said that that statistic must be viewed in context. The Centers for Disease Control and Prevention reports almost 45,000 lives were lost to suicide in 2016.
The report did not second-guess Comey's conclusion that Clinton should not have been prosecuted.
Some poetic justice was also served in the watchdog's findings.
US President Donald Trump addresses a meeting on prison reform at the White House in Washington, DC, on May 18, 2018.
Horowitz is also expected to provide a frank assessment of how former FBI Director James Comey ignored longstanding departmental norms at key moments in the Clinton probe.
How will President Trump react?
"In the August 8, 2016 text message Page questions whether Trump will become president saying, "[Trump's] not ever going to become president, right? In an op-ed published in the New York Times, Comey said the report confirmed the call there was "no prosecutable case" against Clinton, and stood by his decision to inform Congress in that the case had been reopened days before the election. That much-anticipated report is due to be released Thursday afternoon. Andy Biggs of Arizona and Ron DeSantis and Matt Gaetz of Florida sent a letter to Horowitz expressing concern that it may have been watered-down from the original version during an internal review process.
"I hope the substance of this report was maintained throughout the entire review process", Biggs said. "The opinions to me that matter are the opinions of the people that are relevant to our work, day in and day out, all across this country", Wray said during a press conference. "We need complete transparency, and I urge the Inspector General to show Congress all versions of his report leading up to the final product". The report did not discuss the special counsel's investigation.
The Obama FBI under Comey appears to have had an institutional habit of developing cozy relationships with media reporters.