Rep. Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE (R-Calif.), the top Republican on the House Intelligence Committee, has formally requested that Rep. Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.), the chairman of the panel, privately testify as part of the House’s impeachment investigation into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

In a letter to Schiff, which was obtained and released by Fox News, Nunes wrote that the Intelligence Committee should not be conducting a "show trial" impeachment inquiry.

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"On November 6th, you announced the beginning of public hearings associated with the Democratic Party's partisan impeachment inquiry into President Donald J. Trump," Nunes wrote Friday.

"Based on the precedent and lack of jurisdiction, the House Intelligence Committee should not take the lead in conducting such hearings; however, by now the American people know your desire to see the duly-elected president removed from office outweighs your sense of responsibility to running a functioning intelligence oversight committee," he continued.

"Prior to the start of your public show trial next week, at least one additional closed-door deposition must take place," he added. "Specifically, I request that you sit for a closed-door deposition before the House Intelligence, Foreign Affairs and Oversight Committees."

Schiff has emerged as a top target for Trump’s allies on Capitol Hill, with many saying the White House has been robbed of due process.

The House’s impeachment probe was launched in September after a whistleblower raised alarms over Trump’s dealings with Ukraine. Democrats have expressed fears that Trump leveraged $400 million in military aid to Ukraine to pressure Kiev to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a chief political rival.

Several witnesses have since testified that they believed there was a quid pro quo involved in Trump’s dealings with Ukrainian President Volodymyr Zelensky.

Republicans have seized on the fact that Schiff was aware there was a whistleblower, with whom his staff interacted. However, Schiff has said he did not know anything about the person’s complaint prior to its filing.

"Although you publicly claim nothing inappropriate was discussed, the three committees deserve to hear directly from you the substance and circumstances surrounding any discussions conducted with the whistleblower, and any instructions you issued regarding those discussions," Nunes wrote. "Given that you have reneged on your public commitment to let the committees interview the whistleblower directly, you are the only individual who can provide clarity as to these conversations."

The letter indicates that Republicans intend to continue focusing on the investigation's process as a means of defending Trump, even as multiple witnesses expressed misgivings about Trump’s interactions with Zelensky.