House Republicans are escalating their standoff with the FBI over an unreleased document they say ties then-Vice President Joe Biden to a “bribery scheme,” but has links to a Trump-era inquiry that ended with no apparent further action.

The Oversight Committee will vote Thursday on holding FBI Director Christopher Wray in contempt of Congress over the bureau’s decision not to give lawmakers a copy of the document, Chair James Comer (R-Ky.) said Monday after a closed-door meeting with FBI officials.

“At the briefing, the FBI again refused to hand over the unclassified record to the custody of the House Oversight Committee,” Comer said. “Given the severity and the complexity of the allegations contained within this record, Congress must investigate further.”

A committee contempt vote would significantly ramp up House Republicans’ conflict with the FBI, which has faced major flak since the GOP took the majority, given the years-long conflict between the two entities. In addition, such a move would signal a new phase of Comer’s investigation into Biden’s affairs, where Republicans hope to find an elusive direct link between the president’s decision-making and payments his family members received.

The FBI, in a statement, called the decision to move forward with a vote “unwarranted,” adding that the bureau “has continually demonstrated its commitment to accommodate the committee’s request, including by producing the document in a reading room at the U.S. Capitol.”

Republicans control the oversight panel, meaning they can advance the contempt resolution as long as most of their members stay united. Speaker Kevin McCarthy (R-Calif.) has vowed to bring it up on the floor. But even if the entire House GOP finds Wray in contempt, it’s highly unlikely that Biden’s Justice Department would exercise its power to bring any criminal charges.

Even as Republicans move forward with a historic contempt vote — no FBI director has faced a congressional contempt vote in at least four decades — they are offering few new specifics on the details of the allegation contained in the Biden document. In addition to a briefing with FBI officials, Comer and Maryland Rep. Jamie Raskin, the panel’s top Democrat, reviewed the document on Monday.

Comer said Monday that the document “has not been disproven” and that it fits within the frame of his larger probe, which has focused on payments Biden family members received from a network of companies and foreign governments.

But Comer did not respond to questions about what country is involved in the document’s charge or if it relates to Burisma, a Ukrainian gas company where First Son Hunter Biden served on the board. That company has been at the center of the GOP’s years-long broader Biden family focus.

House Oversight Committee Ranking Member Jamie Raskin (D-Md.) and Chair James Comer (R-Ky.) preside over a hearing on social-media bias on Capitol Hill on Feb. 8, 2023.