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Justice Department Inspector General Michael Horowitz has found evidence that an FBI lawyer manipulated a key investigative document related to the FBI's secretive surveillance of a former Trump campaign adviser -- enough to change the substantive meaning of the document, according to multiple reports.

The show-stopping development comes as Senate Judiciary Committee Chairman Lindsey Graham, R-S.C., told Fox News that Horowitz's comprehensive report on allegations of Foreign Intelligence Surveillance Act (FISA) warrant abuse against former Trump campaign aide Carter Page will be released on Dec. 9. "That's locked," Graham said.

The new evidence concerning the altered document, which pertained to the FBI's FISA court warrant application to surveil Page, is expected to be outlined in Horowitz's upcoming report. CNN first reported the news, which was largely confirmed by The Washington Post.

But the Post, hours after publishing its story, conspicuously removed the portion of its reporting that the FBI employee involved worked "beneath" Peter Strzok, the FBI's since-fired head of counterintelligence. The Post did not offer an explanation for the change, which occurred shortly after midnight. Earlier this week, the DOJ highlighted a slew of anti-Trump text messages sent by Strzok when he was leading the Hillary Clinton email investigation and the probe into the Trump campaign.

"The person under scrutiny has not been identified but is not a high-ranking official — they worked beneath former deputy assistant director Peter Strzok, according to people familiar with the investigation who spoke on the condition of anonymity to discuss material that has not yet been made public," The Post wrote in its now-deleted paragraph.

WAYBACK MACHINE SHOWS ORIGINAL VERSION OF THE POST'S STORY, BEFORE STEALTH DELETION

The paper eventually added a correction to the bottom of its piece, reading, "Correction: An earlier version of this story erroneously stated that the FBI employee being investigated for altering a document worked underneath former Deputy Assistant Director Peter Strzok. The employee was a low-level lawyer in the Office of General Counsel and did not report to the deputy assistant director."

Nevertheless, Horowitz reportedly found that the FBI employee was involved enough in the FISA process to falsely state that he had "documentation to back up a claim he had made in discussions with the Justice Department about the factual basis" for the FISA warrant application, the Post reported. Then, the FBI employee allegedly "altered an email" to substantiate his inaccurate version of events. The employee has since been forced out of the bureau.

One-time advisor of U.S. president-elect Donald Trump Carter Page addresses the audience during a presentation in Moscow, Russia, December 12, 2016. REUTERS/Sergei Karpukhin - RC165B503FF0

One-time advisor of U.S. president-elect Donald Trump Carter Page was called "an agent of a foreign power" by the FBI in its 2016 FISA surveillance warrant application. He has not been charged with any wrongdoing despite more than a year of surveillance, and several holes have emerged in the FBI's FISA case. (AP)

In its initial 2016 FISA warrant application, the FBI flatly called Page "an agent of a foreign power."

Sources told Fox News last month that U.S. Attorney John Durham's separate, ongoing probe into potential FBI and Justice Department misconduct in the run-up to the 2016 election through the spring of 2017 has transitioned into a full-fledged criminal investigation -- and that Horowitz's report will shed light on why Durham's probe has become a criminal inquiry.

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Durham has reportedly taken up Horowitz's findings concerning the falsified FISA document, meaning the ex-FBI lawyer who made the changes is now under criminal investigation. The Post indicated, however, that the document was not central to the legality of the FISA warrant obtained against Page.

Republicans have long argued that the FBI's alleged FISA abuses, which came as the bureau aggressively pursued ultimately unsubstantiated claims of criminal links between the Trump team and Russia during the 2016 presidential campaign, were politically motivated. In recent months, a series of unearthed documents has strengthened those claims.

Just nine days before the FBI applied for its first FISA warrant to surveil Page, bureau officials were battling with a senior Justice Department official who had "continued concerns" about the "possible bias" of a source pivotal to the application, according to internal text messages previously obtained by Fox News.

The 2016 messages, sent between Lisa Page and then-FBI Deputy Director Andrew McCabe, also revealed that bureau brass circulated at least two anti-Trump blog articles, including a Lawfare blog post sent shortly after Election Day that called Trump possibly "among the major threats to the security of the country."

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Fox News is told the texts were connected to the ultimately successful Page application, which relied in part on information from British ex-spy Christopher Steele – whose anti-Trump views are now well-documented – and cited Page’s suspected Russia ties. In its warrant application, the FBI inaccurately assured the FISA court on numerous occasions that media sources independently corroborated Steele's claims, and did not clearly state that Steele worked for a firm hired by Hillary Clinton's campaign and the Democratic National Committee (DNC).

Much of the Steele dossier has been proved discredited or unsubstantiated, including the dossier's claims that the Trump campaign was paying hackers in the United States out of a non-existent Russian consulate in Miami, or that ex-Trump lawyer Michael Cohen traveled to Prague to conspire with Russians. Special Counsel Robert Mueller also was unable to substantiate the dossier's claims that Carter Page had received a large payment relating to the sale of a share of Rosneft, a Russian oil giant, or that a lurid blackmail tape involving the president existed.

Despite being accused by the FBI of being a Russian agent in the FISA application, and being secretly surveilled for more than a year, Page has not been charged with any wrongdoing. He has since sued numerous actors -- including the DNC -- for defamation related to claims that he worked with Russia.

Former Trump national security adviser Michael Flynn, seen here in 2018, is alleging that the FBI also doctored documents in his case. (AP)

Former Trump national security adviser Michael Flynn, seen here in 2018, is alleging that the FBI also doctored documents in his case. (AP)

DISPUTE ERUPTS AS BRENNAN, COMEY APPEAR TO DISPUTE WHO PUSHED THE STEELE DOSSIER

"OI [Office of Intelligence] now has a robust explanation re any possible bias of the chs [confidential human source] in the package," Lisa Page wrote to McCabe on Oct. 12, 2016. "Don't know what the holdup is now, other than Stu's continued concerns."

It's unclear whether the confidential source in question was Steele or another individual. "Stu" was an apparent reference to Stuart Evans, then the DOJ's National Security Division deputy assistant attorney general. In one previously unearthed and since-unredacted text message, Strzok texted Page that he was "Currently fighting with Stu for this FISA" in late 2016.

Page is not the only Trump official to allege misconduct by the FBI. Last month, an explosive court filing from Michael Flynn’s legal team alleged that FBI agents manipulated official records of the former national security adviser’s 2017 interview that led to him being charged with lying to investigators. Flynn's attorneys demanded the FBI search its internal "Sentinel" system to find more evidence of allegedly doctored files.

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Newly released text messages involving text messages between Strzok and former FBI lawyer Lisa Page revealed that Page -- who was not present for the Flynn interview -- had apparently made "edits" to the so-called "302" witness report in the case, which was key to Flynn's prosecution on a false statements charge. Page told Strzok on February 10, 2017 that she “gave my edits to Bill to put on your desk.”

Horowitz told congressional lawmakers in an October letter that his investigation and ensuing report were nearing their conclusion.

FBI BLAMES SYSTEM-WIDE SOFTWARE FAILURE FOR MISSING STRZOK TEXTS -- PHONE FROM MUELLER DAYS TOTALLY WIPED

The "lengthy" draft report "concerns sensitive national security and law enforcement matters," Horowitz wrote in the letter, adding that he anticipated "the final report will be released publicly with few redactions."

Horowitz noted that he did not anticipate a need to prepare or issue "separate classified and public versions of the report."

"After we receive the final classification markings from the Department and the FBI, we will then proceed with our usual process for preparing a final report, including ensuring that appropriate reviews occur for accuracy and comment purposes," Horowitz wrote in the letter. "Once begun, we do not anticipate the time for that review to be lengthy."

Fox News' Brooke Singman and Charles Crietz contributed to this report.