In Thursday's hearing of the House Judiciary and Oversight Committees, Republicans hope to further undermine the credibility of the investigation and head off any potential effort to impeach Trump.
"I don't appreciate what was originally said being changed", Strzok said, accusing Gowdy of misrepresenting his earlier testimony.
"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 will say.
Conservatives proceeded to cast one of those text messages as the smoking gun in its case against Strzok in particular, and the FBI investigation into Trump, in general: In response to a message from Page expressing horror at the thought of Trump's election, Strzok replied, "We'll stop it".
To Democrats deriding the committees for their investigation into allegations of bias at the FBI, Goodlatte said "the American people hope you will understand that this investigation goes to the very heart of our system of justice, one that is supposed to be fair and treat everyone equally under the law".
Gowdy pressed Strzok on the texts during the back-and-forth, at one point telling the FBI agent that it's "no wonder Bob Mueller kicked you off the investigation".
"I hesitate in part because of my gut sense and concern there's no big there there", Strzok said in the text.
"It would be his candidacy for the presidency", Strzok said.
Strzok angrily responded, saying the "we'll stop it" text came in response to campaign occurrences such as Trump insulting the immigrant father of a fallen USA soldier.
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 as well as Sen.
Strzok responded, "No. No he's not".
"I have the utmost respect for Congress's oversight role, but I truly believe that today's hearing is just another victory notch in Putin's belt and another milestone in our enemies' campaign to tear America apart", Strzok said.
Republicans have cited Page's and Strzok's messages as evidence about what they call bias inside federal law enforcement and that conspirators launched the Russian Federation investigation out of partisan animus.
On Thursday, House Republicans grilled Strzok for hours, making all manner of incendiary insinuations about what that text implied.
The Justice Department's inspector general has criticized Strzok and Page for creating the appearance of impropriety through the texts.
Former FBI attorney Lisa Page is expected to appear for a closed-door interview before House Committees Friday.
Strzok said there were multiple levels above him and below him at the FBI during the probes, dismissing the idea that he could have influenced either investigation based on a political bias.