Former special counsel Robert Mueller will have one of his closest deputies accompanying him for his high-profile testimony on Wednesday before the House Judiciary and Intelligence Committees after the panels gave the OK for Aaron Zebley to join as Mueller's counsel.

A Judiciary Committee aide confirmed the change Tuesday afternoon, less than 24 hours before Mueller was slated to appear before the House Judiciary and Intelligence committees.

Late Tuesday evening, an Intelligence Committee aide also said Zebley would be accompanying Mueller and would be sworn in at the second hearing Wednesday afternoon.

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Republicans first broadcast the possibility of Zebley’s appearance as a witness Tuesday afternoon on Twitter and elsewhere, claiming his late addition could run afoul of House rules.

Zebley is not expected to testify but will be there to advise his former boss as he faces a deluge of questions from Republicans and Democrats on the special counsel’s 22-month investigation.

Mueller is scheduled to testify in back-to-back hearings before the Judiciary and Intelligence panels beginning at 8:30 a.m.

When asked whether Zebley would also join Mueller for the Intelligence Committee’s hearing earlier Tuesday afternoon, Chairman Adam Schiff Adam Bennett SchiffSchiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power Rubio on peaceful transfer of power: 'We will have a legitimate & fair election' MORE (D-Calif.) said that he expected Mueller would be joined by someone in the special counsel’s office but that the panel was still discussing “precisely in what capacity that person will appear with him.”

“I think it is certainly a desire of the special counsel to have one of his team present with him during the hearing. We are in discussions with them about that, and what that would look like, but our intention is that Mueller do the testifying and not have someone else do it for him,” Schiff said at a Center for American Progress event in Washington, D.C.

Mueller spokesman Jim Popkin told The Hill in a statement that Zebley’s appearance had been a matter of discussion with the committees over more than a week of negotiations.

“Aaron Zebley was the Deputy Special Counsel and had day-to-day oversight of the investigations conducted by the Office. He will accompany Special Counsel Mueller to the Wednesday hearings, as was discussed with the committees more than a week ago," Popkin said.

Rep. Jim Jordan James (Jim) Daniel JordanHouse panel pulls Powell into partisan battles over pandemic Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus MORE (R-Ohio), a prominent Judiciary member, first tweeted that it was possible Zebley would also appear at the witness table on Wednesday while blasting Democrats for changing the rules “right before kickoff.”

Rep. Doug Collins Douglas (Doug) Allen CollinsTrump, Biden running neck-and-neck in Georgia: poll Trump, Biden tied in Georgia: poll Loeffler paints herself as 'more conservative than Attila the Hun' in new campaign ad MORE (Ga.), the top Republican on the committee, also said in a statement it was possible Zebley would testify and criticized Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.), asserting the last-minute change would “jeopardize whether tomorrow's hearing complies with the rules of the House.”

Republicans have not since vocalized objections at Zebley appearing as Mueller’s counsel.

Still, President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE lashed out at the developments, tweeting Tuesday evening that it was “unfair” that Zebley be permitted to accompany Mueller.

“Just got back only to hear of a last minute change allowing a Never Trumper attorney to help 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 with his testimony before Congress tomorrow. What a disgrace to our system. Never heard of this before. VERY UNFAIR, SHOULD NOT BE ALLOWED. A rigged Witch Hunt!” Trump tweeted.

Zebley was one of Mueller’s closest associates who worked on the special counsel’s investigation into Russian interference and potential obstruction by President Trump. Zebley previously served as Mueller’s chief of staff at the FBI.

Zebley is one of two deputies on the special counsel’s team from whom House Democrats had sought closed-door testimony in addition to Mueller’s public appearance. As of last week, the closed-door testimony was off for the House Judiciary Committee, while the House Intelligence Committee was still negotiating with the Justice Department regarding the testimony.

In recent days, Mueller has been preparing for his testimony with a small group of attorneys from the special counsel’s office at his former law firm of WilmerHale, Popkin told The Hill in an interview Monday evening.

House Democrats had sought Mueller’s testimony on his investigation for several weeks. Mueller resisted a voluntary appearance before Congress, eventually leading the committees to subpoena him last month.

Mueller was initially expected to testify on July 17, but his appearance was postponed one week to allow for an additional hour of questioning by the Judiciary panel in exchange for more time for the former special counsel to prepare.

Updated at 9:35 p.m.