GOP Sen. Chuck Grassley of Iowa on Thursday released an internal FBI document containing unverified allegations President Joe Biden was involved in an illegal foreign bribery scheme.

The FBI had previously allowed members of the House Oversight Committee to privately view – but not obtain – the unclassified FBI document, known as an FD-1023.

Republicans, including Grassley and House Oversight Chairman James Comer, have been pushing for the FBI to publicly release the document, which the bureau has declined to do. Grassley said he was able to release the document himself because of “legally protected disclosures by Justice Department whistleblowers.”

The 1023 form memorializes claims from an FBI informant, but it doesn’t provide proof that the allegations are true. Republicans, though, have seized on the unverified material as part of their broader investigation into the Bidens.

The FBI document indicates that the informant provided the information to federal investigators in June 2020, but was describing meetings and conversations dating back to 2015.