A Justice Department watchdog is expected to strongly criticize FBI officials for being careless in their pursuit of obtaining wiretaps on a former Trump campaign aide during the start of the Russia probe, but not find they were acting with a bias toward President TrumpDonald John TrumpWatergate prosecutor says that Sondland testimony was 'tipping point' for Trump In private moment with Trump, Justice Kennedy pushed for Kavanaugh Supreme Court nomination: book Obama: 'Everybody needs to chill out' about differences between 2020 candidates MORE, The New York Times reported Friday afternoon.

But the highly anticipated report from the Department of Justice inspector general (IG) is also expected to say top agency leaders did not act with a bias toward against President Trump in terms of how they undertook the probe.

In particular, the DOJ IG, Michael Horowitz, faulted Kevin Clinesmith, a lower-level lawyer, for altering an email that bureau officials then incorporated in their effort to renew a Foreign Intelligence Surveillance Act (FISA) warrant on Carter Page. 

The DOJ watchdog has referred his findings about Clinesmith, who resigned two months ago, to prosecutors for a potential criminal charge, the Times reported.

Horowitz also reportedly found omissions and errors in documents seeking the wiretap for Page, who had served previously on the Trump campaign and was suspected of working as an unregistered foreign agent in 2016.

And while the Times reports that Horowitz will sharply rebuke the top brass at the FBI over their handling of the counterintelligence probe — which was examining whether members of the Trump campaign coordinated with Russia— his investigation did not find that anti-Trump bias among senior leaders like former FBI director James ComeyJames Brien Comey3 reasons why impeachment fatigue has already set in Day 2 impeachment ratings drop by more than 1 million from first day Chris Wallace on Yovanovitch testimony: 'If you're not moved, you don't have a pulse' MORE, deputy director Andrew McCabeAndrew George McCabeThe curious timeline for taking down Trump Federal prosecutors interviewed multiple FBI officials for Russia probe review: report Brendan Gleeson lands Trump role in CBS miniseries based on Comey memoir MORE, and former counterintelligence agent Peter Strzok influenced the investigation.

While the report, set to be publicly released Dec. 9, appears to confirm long-held GOP allegations that officials did not follow the proper protocols in obtaining the Page FISA warrant, the report also disputes their allegations that individuals like Comey, McCabe and Strzok acted on biases towards the president.

Horowitz's report also debunks claims that the so-called Steele dossier compiled by the former British spy Christopher Steele was used by officials to launch the investigation, as well as allegations that some of the information came from the CIA officials.

Democrats and Republicans are likely to seize on different parts of the report, particularly at a time when House Democrats' impeachment inquiry is looming over the Trump administration. 

The FBI obtained a FISA warrant on Page in October of 2016 and renewed the wiretap three subsequent times.

And during one of those renewal processes, Clinesmith is said to have altered an email from an official working at another federal agency by adding his own personal assertion to a message laying out several factual assertions, allowing his view point to appear as if was the author of the email rather than his own, the Times reports.

This manipulated email was then added into a group of documents Clinesmith compiled for another FBI official to read ahead of them signing an affidavit that is given to the surveillance court, which attests under the penalty of perjury that the information in the wiretap application is both "true and correct." 

Clinesmith, who worked on both the investigation into Hillary ClintonHillary Diane Rodham ClintonDemocratic strategist laments 'low bar' for Biden debate performance Wasserman Schultz makes bid for House Appropriations Committee gavel Trump to hold campaign rally in Pennsylvania next month MORE's email server and the Russia probe, was removed from special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump MORE's team after Horowitz discovered text messages sent from officials that disparaged Trump.

Horowitz's referral has reportedly been sent to Connecticut U.S. Attorney John DurhamJohn DurhamFBI official under investigation for allegedly altering document in Russia probe: report No credibility in this braying for Trump's removal Impeachment tests Barr-Trump relationship MORE, who was assigned by Attorney General William BarrWilliam Pelham BarrThe truth about presidential power GOP rep predicts watchdog report on alleged FISA abuses will find 'problems' Barr defends Trump's use of executive authority, slams impeachment hearings MORE to probe the origins of the Russia investigation. The referral suggests that Durham's inquiry could turn into a criminal investigation.