House Intelligence Committee Chairman 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.) on Saturday effectively denied Republican lawmakers' request for a government whistleblower to testify in the impeachment inquiry 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.

Schiff, who has helped lead the impeachment hearings of Trump and his dealings with Ukraine, said in a letter to 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 ranking member of the Intelligence panel, that the whistleblower's testimony would be "redundant" and "unnecessary," according to multiple reports.

"The impeachment inquiry, moreover, has gathered an ever-growing body of evidence — from witnesses and documents, including the President's own words in his July 25 call record — that not only confirms, but far exceeds, the initial information in the whistleblower's complaint," Schiff said. "The whistleblower's testimony is therefore redundant and unnecessary.

ADVERTISEMENT

Schiff added that "the individual's appearance before us would only place their personal safety at grave risk" because of Trump's repeated threats.

The whistleblower complaint accusing Trump of pushing Ukraine to open investigations for his political benefit led House Democrats in September to launch an impeachment inquiry. Multiple House committees have heard depositions from numerous former and current administration officials corroborating the whistleblower's account behind closed doors, and public hearings are scheduled for this week.

The investigation has centered around allegations that Trump urged Ukrainian President Volodymyr Zelensky to investigate 2020 presidential candidate 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 and that military aid was tied to Kiev publicly declaring the probe.

Schiff's statement came just hours after Republicans sent him a letter including a list of individuals they'd like to testify in the public impeachment hearings. The government whistleblower and former Vice President Joe Biden's son, Hunter Biden, were included on the list.

Nunes on Friday also formally requested that Schiff privately testify amid the investigation, arguing that the congressman was making a "show trial" of the impeachment inquiry.

ADVERTISEMENT

In his letter to Nunes, Schiff emphasized that he wouldn't allow lawmakers to use the open hearings to carry out "sham" investigations into the Biden family.

"The committee also will not facilitate efforts by President Trump and his allies in Congress to threaten, intimidate and retaliate against the whistleblower who courageously raised the initial alarm," he said.

Trump and several Republicans have become increasingly outspoken in their push for the whistleblower to testify. Trump claimed last week that the figure had to "come forward" because the person got it "sooo wrong."