This is because Strzok had participated in both the Hillary Clinton email investigation and the special counsel's probe into the Trump campaign's ties to Russian Federation - but was removed from the latter last summer, after an internal investigation discovered that he had expressed a low opinion of Donald Trump during the 2016 presidential race in text messages with his colleague Lisa Page.
Strzok had told Gowdy he was unable to answer a question related to the Russian Federation probe, saying he had been instructed not to comment on matters related to an ongoing investigation.
Strzok acknowledged that while his text message criticism was "blunt", it was not directed at one person or political party and included jabs not only at Trump but also at Clinton and Sen. She will instead appear in a closed-door hearing on Friday, House Judiciary Committee Chairman Bob Goodlatte told Fox Business Network.
But later, Strzok testified that he wrote the text "in response to a series of events that included then-candidate Trump insulting the immigrant family of a fallen war hero, and my presumption based on that awful disgusting behavior [was] that the American population would not elect someone demonstrating that behavior to be president of the United States".
He will say that he has never allowed personal opinions to infect his work and that he knew information during the campaign that could have damaged Trump but never contemplated leaking it.
"Not at all", a defiant Strzok said. "Agent Strzok had Donald Trump impeached before he even started investigating him. No he won't. We'll stop it".
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After Mr Strzok said he'd appreciate the chance to explain, the chair of the House Government Oversight Committee shot back: "I don't give a damn what you appreciate, agent Strzok".
"We'll stop it", Strzok texted Page in August 2016 - apparently referring to the prospect of Trump being elected president, according to a June report by the inspector general.
"I don't recall and I have to check the case file", he said.
"Like many people, I had and expressed personal political opinions during an extraordinary presidential election. opinions that were not always expressed in terms I am proud of", he said. It simply couldn't happen.
At the end of his monologue, Democrats in the committee chamber applauded.
Why was the Russian Federation probe started in the first place? The text and emails may have been discovered in May of 2017, but the bias existed and was manifest a year and a half before that.
Strzok argued that Mueller did not remove him from his team because of bias, but because of the perception the texts created.
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"Let me be clear, unequivocally and under oath: not once in my 26 years of defending my nation did my personal opinions impact any official action I took", he is expected to say. But the thought of exposing that information never crossed my mind.
Put those texts aside for a moment. Strzok replied: "No, he's not".
"I'm asking, if you want to have a debate over a two-letter word, we're going to have to do that some other time".
Republicans eager for ways to discredit Mueller's investigation have for months held up the texts from Strzok and Page to support allegations of anti-Trump bias within federal law enforcement.
Jeffress accused the panels of using unnecessary "bullying tactics" to push Page into an interview immediately, especially when "she has offered to voluntarily appear before the committees later this month".
To recap, Strzok was removed from the Mueller investigation and harshly criticized by an inspector general. But the report said it found no evidence of political bias in the FBI's decision to not pursue criminal charges against Clinton.
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