Republicans on the House Judiciary Committee are calling for the panel to expand its list of witnesses ahead of the Dec. 4 hearing it will hold in the House’s impeachment investigation into President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE.

Rep. Doug Collins Douglas (Doug) Allen CollinsDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements GOP, Democrats look to galvanize women with SCOTUS fight MORE (R-Ga.), the ranking member of the Judiciary Committee, sent a letter to 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.) demanding that he expand the panel beyond the four constitutional law scholars from whom the committee plans to hear.

“To ensure fairness and restore integrity to the ongoing impeachment process, I request an expanded panel and a balanced composition of academic witnesses to opine on the subject matter at issue during the hearing,” he wrote.

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"On December 4, the Committee will hear from only four academic witnesses during its consideration of the question of impeachment. This is less than a quarter of those called to testify during the Clinton impeachment," he continued. "In light of this, I request that you expand the number of witnesses called upon to testify on December 4 to give the American people a wider array of perspectives regarding impeachment."

The letter did not clarify which witnesses the Republicans would seek to call.

Staff for the Democrats on the committee did not immediately respond to a request for comment from The Hill.

Nadler wrote to Collins on Friday asking if he would like to issue any subpoenas or interrogatories relating to the matter. He also gave the ranking member until Dec. 6 to notify him.

“I am prepared to schedule a meeting of the Committee on Monday, December 9, 2019 to consider any such referrals,” Nadler wrote to Collins.

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A Republican Judiciary aide told The Hill in an email that Nadler has not responded to four recent letters from Republicans with concerns about the impeachment probe.

The Dec. 4 hearing is set to take place after the Intelligence Committee sends the Judiciary Committee a memo with its findings from seven public impeachment hearings and a series of additional closed-door depositions regarding Trump’s dealings with Ukraine. It will be the first time the Judiciary panel examines the Intelligence panel’s evidence from the investigation, which was launched in late September.

The Judiciary Committee will ultimately decide whether to the evidence gathered during the probe warrants drafting articles of impeachment that will be voted on by the entire House.