The head of the House Judiciary Committee is threatening to soon issue a subpoena against the Department of Justice (DOJ) seeking documents into how the FBI handled it's probe into Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE's use of a private email server as secretary of State.

Rep. Bob Goodlatte Robert (Bob) William GoodlatteNo documents? Hoping for legalization? Be wary of Joe Biden Press: Trump's final presidential pardon: himself USCIS chief Cuccinelli blames Paul Ryan for immigration inaction MORE (R-Va.) said the order would be issued soon because Republicans have only received a "tiny percentage" of documents that they’ve repeatedly requested, roughly 3,000 out of 1.2 million documents on a voluntary rolling basis since launching the probe in late October.

Goodlatte is running a joint investigation into the matter with House Oversight and Government Reform Committee Chairman Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.). The lagging pace of document turnover has fueled frustrations among the GOP lawmakers who now say they are willing to subpoena for the documents if their record demand is not quickly fulfilled.

“We need to have those documents,” Goodlatte told host Maria Bartiromo on Fox News Channel's “Sunday Morning Futures.”

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“We've had communications with the Department of Justice about this and they know that not just myself and Chairman Gowdy, but many other members of the House are very concerned about the slow nature of those documents being produced. And as I say, actions are going to have to take a new level here very soon,” he said.

DOJ Inspector General Michael Horowitz has separately been examining the FBI and DOJ’s actions as they relate to the Clinton probe.

GOP lawmakers are eager to learn more about what Horowitz uncovered regarding the private text messages between FBI agent Peter Strzok and FBI lawyer Lisa Page, who disparaged then-candidate Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE and other political figures during the 2016 election.

The messages have become a flash point for Republicans who say the Strzok-Page exchange is proof of anti-Trump bias operating within high government levels.

Strzok’s involvement with the Clinton investigation, including his reported role in drafting the Clinton exoneration letter, has further escalated the scrutiny against him.

Both FBI officials also served on special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s team that is investigating Russian interference in the election, a connection that has fueled the GOP attacks against the investigative team.

They argue that the team investigating whether the Trump campaign colluded with the Kremlin is filled with Democrats and Clinton cronies, despite Mueller’s well-known reputation as a Republican.

The two officials were promptly removed from Mueller’s team after the internal investigation uncovered their text messages.

The Republican lawmakers in recent months have homed in on whether there was any “extraneous influence” on the surveillance process of Trump campaign aides.

Earlier this month, Goodlatte and Gowdy called for a second special counsel to investigate the bureau’s handling of the Clinton probe. Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE has publicly pushed back on those demands.

Another key player who has been caught in the eye of the firestorm is former FBI Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE.

Horowitz reportedly found that McCabe was not forthcoming about his contacts with the media, including inappropriate disclosures to the press. The findings of the independent investigation prompted Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE to fire McCabe on Friday night, just two days before his scheduled retirement.

McCabe, who has maintained he did nothing wrong, has long been a GOP target — partly because of his wife’s ties to Clinton allies as well as his relationship with former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE. After he was fired, Trump on Twitter called his ouster a “great day for the hardworking men and women of the FBI.”

McCabe in a statement argued that the attempts to discredit him are part of a greater effort to “taint the FBI, law enforcement, and intelligence professionals more generally.”

He claimed he is being “singled out” because of his ties to Comey, who was leading the FBI investigation into Moscow’s meddling before Trump fired him last May.

Comey last year claimed during a congressional hearing that the president asked him to take a loyalty pledge as well as bring his Russia probe to an end. McCabe is seen as a key witness who can offer insight into Comey’s interactions with Trump and potentially corroborate them.

The spotlight is likely to shift to Comey next month as he releases a memoir that is expected to get into his exchanges with Trump, among other topics.

- Updated at 2:12 p.m.