Justice Department Inspector General (IG) Michael Horowitz said that John DurhamJohn DurhamSteele Dossier sub-source was subject of FBI counterintelligence probe Barr's Russia investigator has put some focus on Clinton Foundation: report Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE, the U.S. attorney in Connecticut conducting a separate probe into the origins of the Russia investigation, told him he believed the FBI would have been justified in opening a “preliminary investigation” into associates of the Trump campaign in 2016, but not a full investigation.

Senators questioned Horowitz Wednesday during a Judiciary Committee hearing about Durham’s terse public statement, issued shortly after the IG's report was released Monday, disagreeing with some of its conclusions “as to predication and how the FBI case was opened."

Horowitz told the committee that he was “surprised” by the statement and noted that he met with Durham, who is spearheading the Justice Department’s separate inquiry into the origins of the Russian interference probe, in November to discuss his findings.

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“We did discuss the opening issue. He said that he did not necessarily agree with our conclusion about the opening of a full counterintelligence investigation, which is what this was,” Horowitz said under questioning from Sen. Dianne Feinstein Dianne Emiel FeinsteinHawley warns Schumer to steer clear of Catholic-based criticisms of Barrett Senate GOP set to vote on Trump's Supreme Court pick before election Trump taps Amy Coney Barrett for Supreme Court, setting up confirmation sprint MORE (D-Calif.).

“But there is also an investigative means by which the FBI can move forward with an investigation, it’s called a preliminary investigation,” Horowitz continued. “[Durham] said during the meeting that the information from the friendly foreign government was, in his view, sufficient to support the preliminary investigation.”

Horowitz said that some of the steps the FBI took in its investigation into the Trump campaign and Russia — dubbed “Crossfire Hurricane” — would have been allowed under a preliminary investigation.

Horowitz’s more than 400-page report says the FBI had an adequate predicate for launching the counterintelligence investigation into associates of the Trump campaign, but it is also heavily critical of the FBI’s handling of a surveillance warrant to wiretap former Trump campaign adviser Carter Page.

Horowitz has referred evidence he found that an FBI lawyer altered a document used to obtain the Page warrant to Durham for possible criminal prosecution.

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Horowitz reiterated Wednesday that the FBI opened the investigation in July 2016 after receiving information from a friendly foreign government about George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, another ex-Trump campaign adviser, saying the Russians had harmful information on Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE.

Durham and Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE both issued statements disagreeing with Horowitz’s conclusion about the investigation being justified on Monday.

“Our investigation has included developing information from other persons and entities, both in the U.S. and outside of the U.S.,” Durham said Monday. “Based on the evidence collected to date, and while our investigation is ongoing, last month we advised the Inspector General that we do not agree with some of the report’s conclusions as to predication and how the FBI case was opened.”

A spokesman for the U.S. attorney’s office in Connecticut declined to comment on Wednesday.

“I was surprised by the statement. I didn’t necessarily know it was going to be released on Monday,” Horowitz told the Senate panel.

Barr elaborated on his disagreement in an interview with NBC News on Tuesday, saying he thought the case was “flimsy” and that the FBI was not justified to take the investigative steps that it did.

Barr also said that it was possible agents acted in “bad faith” and seemed to dismiss Horowitz’s finding that agents did not act on political bias in opening the probe, saying it would be “premature” to reach a conclusion on motivations until after Durham’s investigation.

Horowitz also said Tuesday that he communicated his findings to Barr and that the attorney general did not give him any information to change his conclusions about the investigation being justified.

“None of the discussions changed our findings here,” Horowitz said.