Horowitz noted, however, that there was "no evidence" of political bias or "improper considerations" in the closing of the investigation without the prosecution of Clinton.
On Thursday, Horowitz's office released a scathing report that documented FBI officials' mishandling of the Clinton investigation. In addition to Strzok and Page, the report identifies anti-Trump text messages from FBI employees referred to as FBI Attorney 2, FBI Agent 1, and FBI Agent 5.
Several Democrats wondered why the committee was having a hearing on Mrs. Clinton's emails instead of taking up the issue of families being separated after entering the country illegally at the southern border.
"I feel as though sunshine, transparency would be the way to root out this bias that we seem to see reflected", said Rep. Matt Gaetz, R-Fla. Trump has already claimed the report exonerated him and on Tuesday, his campaign manager, Brad Parscale, said the report gave Trump justification to fire his attorney general and end the Mueller investigation.
Horowitz declined to answer the question.
Horowitz was asked to explain how the officials could be biased without the investigation being tainted by that, in an exchange with Del.
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But his texts have now become a talking point for Republicans - especially Trump - claiming bias in the Russian Federation investigation.
He added that he thinks it is "very close to being thrown out" because it is compromised by what was contained the inspector general's report.
President Donald Trump's congressional allies trained their fire on the special counsel investigation on Tuesday, armed anew with a damaging report showing that the lead FBI agent assigned to the case held strong anti-Trump views when the inquiry began.
Rep. Mark Meadows, the chairman of the conservative Freedom Caucus and leading voice for the right in the House of Representatives, asked Justice Department Inspector General Michael Horowitz to investigate the witness forms, known as 302s, that are used by the FBI to record activity in their investigations.
Then FBI General Counsel James Baker told the inspector general that "the discussion was somebody in NY will leak this". The person spoke on condition of anonymity because the meeting was not public.
Comey didn't deny using his personal Gmail account for government business, but said that the difference between him and Clinton was that he didn't use it to send or receive classified information, and the IG report didn't say he did.
Rep Ted Poe (R-Texas) asked the IG if he could reveal the identities of the unnamed Federal Bureau of Investigation officials who were mentioned in the report. "The arrogance and condescension and the elitist attitude, that's what ticks people off", he said. The Justice Department's inspector general had previously told lawmakers privately that he will review the handling of the memos, according to people familiar with the matter.