Justice Department Inspector General Michael Horowitz is at the helm of an investigation that might be the most flammable and anticipated of his career, The Hill reports.

Horowitz is already a year into an investigation to determine whether the FBI properly handled its probe into Hillary Clinton's private email server.

And both sides are ready to pounce when Horowitz's final report concludes sometime this spring, The Hill reported.

Democrats are looking for validation that former FBI Director James Comey cost Clinton the White House with his on-again, off-again investigations, the latest which came 10 days before the election.

Republicans and President Donald Trump are in search of proof that the justice system and its players are biased against the president so that they can paint the special counsel's Russia investigation with that brush, too.

Horowitz's forthcoming report has already cost FBI deputy director Andrew McCabe his job, but the man behind the investigation into the infamous "Fast and Furious" gun-running operation is being held up as an "honest broker" who couldn't care less about the aftermath of his report.

"He is really one of the smartest and fairest people I have ever had the pleasure to work with," Bill Hamel, a former assistant IG at the Department of Education told The Hill. "He's a straight shooter and a fair guy. He's an honest broker."

Regardless, the saga around the exit of McCabe, who was running the investigation into Clinton's emails and private server, would suggest that Horowitz's report is not going to be a good one for the FBI.

"There are a lot of legitimate questions that I hope would be answered by this inspector and that probably aren't going to paint the DOJ or the FBI in a particularly good light," Ron Hosko, a former FBI official told The Hill.