The inspector general, Michael Horowitz, on Wednesday firmly stood by his report, published on Monday, that concluded that although FBI agents made some significant errors as they began their investigation of Trump's campaign, examples of sloppiness were far outweighed by the gravity of the legitimate legal justification for launching the inquiry, which was taken over by the special counsel Robert Mueller in 2017.
The department's Inspector General Michael Horowitz told lawmakers that he and a US prosecutor conducting a separate review disagreed about a fundamental question of the politically sensitive inquiry.
Mr. Durham, who is running a parallel investigation into the origins of the FBI's Russian Federation probe, said he disagreed with the inspector general's conclusion that the FBI had enough evidence to launch the investigation.
Horowitz said Wednesday he was surprised that U.S. Attorney John Durham issued a statement disputing his conclusions on the FBI's probe of the Trump campaign.
Durham's office declined to comment.
"How many I.G. Reports under your name involve the Justice Department arguing that in fact committed more misconduct than your investigation uncovered?"
Donald Trump and attorney general William Barr attacked Horowitz's report after its release. The report counted seven "significant inaccuracies and omissions" in the original application and 10 "additional significant errors" in the three renewal requests, including one resulting from alleged document tampering by a low-level Federal Bureau of Investigation lawyer.
Durham said on Monday that he did not agree with Horowitz about how the case was opened. Senators from both parties praised a detailed, nuanced report by a widely respected, nonpartisan investigator, while pressing him to call attention to findings that back their positions. His review will likely wrap up in the spring or summer of next year, during the height of Trump's re-election campaign.
"We also identified what we believe is an absence of sufficient policies to ensure appropriate department oversight of significant investigative decisions that could affect constitutionally protected activity", said Horowitz, whose opening statement was released publicly before he testified. People at the highest level of our government took the law in their own hands. Dianne Feinstein's (D., Calif.) opening statement. He said the code name for the FBI investigation, "Crossfire Hurricane", was an apt title "because that's what we ended up with - a 'Crossfire Hurricane'".
Horowitz's testimony is significant because some in the media were adamant in their claims that the Steele Dossier, complied by former British spy Christopher Steele, was not the basis for the FISA warrants or that the applications met the requirements.