Trump calls for Mueller deputy to be blocked from testimony

President TrumpDonald John TrumpRouhani says Iran will never seek nuclear weapons Trump downplays seriousness of injuries in Iran attack after US soldiers treated for concussions Trump says Bloomberg is 'wasting his money' on 2020 campaign MORE knocked the House Judiciary Committee late Tuesday for allowing one of former special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay 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.

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 CollinsDouglas (Doug) Allen CollinsThe Hill's Morning Report - Trump trial begins with clash over rules This week: Raucous rules fight, opening arguments in impeachment trial White House appoints GOP House members to advise Trump's impeachment team MORE (Ga.), the top Republican on the committee, criticized Judiciary Committee Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerMcConnell locks in schedule for start of impeachment trial Pelosi: Trump's impeachment 'cannot be erased' House to vote Wednesday on sending articles of impeachment to Senate 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 ClintonHillary Diane Rodham ClintonThe Hill's Morning Report - Trump trial begins with clashes, concessions Trump on Clinton's Sanders comments: 'She's the one that people don't like' Hillary Clinton tears open wound with her attack on Sanders 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.

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 JordanJames (Jim) Daniel JordanCheney's decision not to run for Senate sparks Speaker chatter The Hill's Morning Report - Trump trial begins with clash over rules This week: Raucous rules fight, opening arguments in impeachment trial MORE (R-Ohio), a member of the Judiciary panel and a chief attack dog on behalf of the White House.

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.