Trump calls for Mueller deputy to be blocked from testimony

President TrumpDonald John TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report MORE knocked the House Judiciary Committee late Tuesday for allowing one of former special counsel Robert MuellerRobert (Bob) Swan MuellerSpeier says impeachment inquiry shows 'very strong case of bribery' by Trump Gowdy: I '100 percent' still believe public congressional hearings are 'a circus' Comey: Mueller 'didn't succeed in his mission because there was inadequate transparency' 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 CollinsHouse to vote on bill to ensure citizenship for children of overseas service members GOP lawmaker: Schiff should be first witness Republicans call to testify in impeachment inquiry Hillicon Valley: Google buying Fitbit for .1B | US launches national security review of TikTok | Twitter shakes up fight over political ads | Dems push committee on 'revenge porn' law MORE (Ga.), the top Republican on the committee, criticized Judiciary Committee Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerHouse to vote on bill to ensure citizenship for children of overseas service members As impeachment goes public, forget 'conventional wisdom' What this 'impeachment' is really about — and it's not the Constitution 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 ClintonDemocrats worry they don't have right candidate to beat Trump Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment Outsider candidates outpoll insider candidates 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 JordanJim Jordan: Latest allegation of ignoring sexual misconduct is 'ridiculous' Democrats face make-or-break moment on impeachment Here are the key players to watch at impeachment hearing 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.