Strzok, who has been at the bureau for more than 20 years and previously served in the U.S. Army, played critical roles in the investigation of former Secretary of State Hillary Clinton and the bureau's then-secretive probe of ties between Russian Federation and the Trump campaign.
"Mr. Gowdy, my understanding of why I was kicked off was that based on an understanding of those texts, and the perception that they might create-" Strzok responded.
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".
Strzok sought to explain his texts, including when he told Page "we'll stop" Trump, which he said was written in response to Trump's attacks on a Gold Star family during the 2016 campaign.
"At no time in any of these texts did those personal beliefs ever enter into the realm of any action I took", Strzok said.
Peter Strzok, who helped lead the FBI investigations into Hillary Clinton's email use and potential coordination between Russian Federation and Donald Trump's campaign, will testify publicly for the first time since being terminated from special counsel Robert Mueller's team following the discovery of the derogatory text messages a year ago.
"Mr. Strzok, you are under subpoena, and are required to answer the question", Goodlatte said.
While the report found that the Federal Bureau of Investigation did not let political bias affect its findings in the Clinton probe, inspector general Michael Horowitz also pointed out that it was troubling that senior Federal Bureau of Investigation officials displayed their preference for Clinton over Trump so clearly during a politically sensitive time.
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.
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. Page will attend a closed-door interview on Friday with the committees.
"My presumption [was] based on that awful, disgusting behavior that the American population would not elect somebody demonstrating that behavior to be president of the United States", Strzok explained.
But that's unlikely to be the focus of Thursday's hearing.
Chairman Goodlatte made the announcement during an interview Thursday, saying the details are still being worked out.
Strzok is testifying publicly on Capitol Hill for the first time since the release of a Justice Department inspector general report that heavily criticized his comments.
Ahead of the hearing, Nadler and Rep. Elijah Cummings of Maryland, the top Democrat on the House Oversight Committee, issued a statement Wednesday knocking the questions Republicans had asked of Strzok in the closed session, including queries on his extramarital affair with Page and his vote in 2016.
"It would be his candidacy for the presidency", Strzok said.