Wray's testimony comes days after the White House said it would not release a memo authored by Democrats on the House Intelligence Committee, which was meant as a rebuttal to a GOP document that President Trump declassified over the objections of the FBI.

Straying from the core topic of the hearing, Republican lawmakers are certain to pepper Wray with questions about the allegations in the Republican memo — that the FBI shielded from a surveillance court the Democratic origins of a dossier that was used to secure a warrant to spy on a member of President Trump's campaign.

As The Hill adds, Wray is also likely to be quizzed on allegations of political bias among senior agents involved in the investigation into Hillary Clinton's handling of classified material.