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 knocked the House Judiciary Committee late Tuesday for allowing one of former special counsel 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’s deputies to accompany him during his testimony Wednesday, saying he should not be able to appear for the hearing.

"Just got back only to hear of a last minute change allowing a Never Trumper attorney to help Robert Mueller with his testimony before Congress tomorrow. What a disgrace to our system. Never heard of this before," Trump tweeted.

"VERY UNFAIR, SHOULD NOT BE ALLOWED. A rigged Witch Hunt!" he added.

Just got back only to hear of a last minute change allowing a Never Trumper attorney to help Robert Mueller 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! — Donald J. Trump (@realDonaldTrump) July 23, 2019

The Judiciary panel said earlier in the day it would permit Aaron Zebley to join Wednesday’s hearing as Mueller's counsel, a change announced less than 24 hours before the former special counsel's blockbuster testimony is set to begin.

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A Republican source told The Hill earlier Tuesday that Mueller had requested that Zebley join him.

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, 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.) over the move, asserting it would “jeopardize whether tomorrow's hearing complies with the rules of the House.”

Trump’s ire toward Zebley is likely sparked by the fact that he represented the IT aide who helped Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE set up a private email server.

"His lawyer represented the “basement server guy” who got off free in the Crooked Hillary case. This should NOT be allowed," Trump said in a subsequent tweet.

So Robert Mueller has now asked for his long time Never Trumper lawyer to sit beside him and help with answers. What’s this all about? His lawyer represented the “basement server guy” who got off free in the Crooked Hillary case. This should NOT be allowed. Rigged Witch Hunt! — Donald J. Trump (@realDonaldTrump) July 24, 2019

Republicans first cast Zebley’s presence as an attempt to add a second witness to the hearing, which they said would run afoul of House rules.

“You don’t get to change the rules right before kickoff, especially after a 22 month, $30 million investigation,” tweeted 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 member of the Judiciary panel and a chief attack dog on behalf of the White House.

Rumor is that Aaron Zebley (Mueller’s Chief of Staff) will be on the witness panel with Mueller.



You don’t get to change the rules right before kickoff, especially after a 22 month, $30 million investigation. — Rep. Jim Jordan (@Jim_Jordan) July 23, 2019

Zebley is not expected to testify and is instead expected to advise his former boss as he faces an avalanche of questions over his two-year probe into Russia's election meddling and obstruction of justice. Zebley worked closely with Mueller during the special counsel investigation and was chief of staff to Mueller during his time heading the FBI.

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