The head of the House Judiciary Committee is expected to subpoena the Department of Justice (DOJ) as soon as this week to obtain documents related to how the FBI handled its investigation into’s email server, The Hill has learned.

Rep.(R-Va.) and House Oversight and Government Reform Committee Chairman(R-S.C.) have been leading a joint probe into what the two lawmakers say may be evidence of political bias in the highest levels at the Justice Department.

While one source with direct knowledge of the matter cautioned that the exact timeline was still murky, multiple sources told The Hill that they expect the summons to go out Wednesday or Thursday.

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The chairman on Monday notified the ranking Democrat, Rep. Jerrold Nadler (D-N.Y.), that a subpoena is forthcoming, a spokesperson separately confirmed.

Under Judiciary committee rules, the chairman must consult the ranking member two business days “before issuing any subpoena” — suggesting that the move is imminent.

Republicans have become increasingly frustrated over the past couple months at what they say is the lagging pace in which the DOJ has turned over documents from the inspector general’s concurrent probe into the 2016 presidential election. GOP lawmakers say they’ve received only a small fraction of the records they want to obtain — approximately 3,000 out of 1.2 million documents.

Goodlatte has been under tremendous pressure from conservatives in his own committee to pick up the pace of the investigation. On Sunday, he threatened to subpoena the law enforcement agency “soon” if it did not turn over the documents the committee is seeking.

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

“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.

It remains unclear which officials the subpoena will target. A Justice Department spokesperson declined to comment.

Lawmakers have privately buzzed since last week that the chairman was preparing a subpoena, suggesting they have no other choice but to issue a summons for the records that they say they want to review before interviewing additional witnesses.

“I would hope that we wouldn’t have to compel them to comply, but more and more evidence would suggest that compelling them to deliver documents may be our only recourse,” Rep. Mark Meadows Mark Randall MeadowsAirline CEOs plead with Washington as layoffs loom Trump reacts to Ginsburg's death: 'An amazing woman who led an amazing life' Trump carries on with rally, unaware of Ginsburg's death MORE (R-N.C.), the head of the conservative House Freedom Caucus, told The Hill.

“He’s a cautious guy, so to get to this point ought to tell you something,” Gowdy said Tuesday, referring to Goodlatte.

A spokesperson for the chairman declined to comment on the timeline.

“No news yet,” Goodlatte said Tuesday, before heading into the House chamber.

Since launching the investigation in late October, the committee has interviewed two FBI officials as part of the probe.

Gowdy insisted Monday that the subpoena decision was up to Goodlatte, saying that he has allowed the veteran lawmaker to take the lead.

“In my judgment, he’s the chairman of the Judiciary. He has primary jurisdiction. I’ll let him take the lead. I mean, I support them 1000 percent, but they shouldn’t need to hear from both of us,” he told The Hill.