Rudy Giuliani, former New York City mayor and current lawyer for U.S. President Donald Trump, speaks to members of the media during a White House Sports and Fitness Day at the South Lawn of the White House May 30, 2018 in Washington, DC.
PHOTO: Alex Wong/Getty Images
Rudy Giuliani, former New York City mayor and current lawyer for U.S. President Donald Trump, speaks to members of the media during a White House Sports and Fitness Day at the South Lawn of the White House May 30, 2018 in Washington, DC.
Now playing
01:03
Rudy Giuliani: I've accomplished my mission
WASHINGTON, DC - MARCH 05: Sen. John Cornyn (R) (R-TX) talks with Sen. Joe Manchin (D-WV) while walking to the U.S. Senate chamber for a vote March 05, 2021 in Washington, DC. The Senate continues to debate the latest COVID-19 relief bill.  (Photo by Win McNamee/Getty Images)
PHOTO: Win McNamee/Getty Images
WASHINGTON, DC - MARCH 05: Sen. John Cornyn (R) (R-TX) talks with Sen. Joe Manchin (D-WV) while walking to the U.S. Senate chamber for a vote March 05, 2021 in Washington, DC. The Senate continues to debate the latest COVID-19 relief bill. (Photo by Win McNamee/Getty Images)
Now playing
02:54
Axelrod breaks down Manchin's surprising move
sinema
PHOTO: CNN
sinema
Now playing
01:50
Senator's move has many on the internet outraged
PHOTO: FBI
Now playing
02:58
Trump State Department official charged in Capitol riot
WASHINGTON, DC - JANUARY 06: U.S. Sen. Paul Gosar (R-AZ) speaks on the floor of the House Chamber during a joint session of congress on January 06, 2021 in Washington, DC. Congress held a joint session today to ratify President-elect Joe Biden's 306-232 Electoral College win over President Donald Trump. A group of Republican senators said they would reject the Electoral College votes of several states unless Congress appointed a commission to audit the election results. (Photo by Drew Angerer/Getty Images)
PHOTO: Drew Angerer/Getty Images
WASHINGTON, DC - JANUARY 06: U.S. Sen. Paul Gosar (R-AZ) speaks on the floor of the House Chamber during a joint session of congress on January 06, 2021 in Washington, DC. Congress held a joint session today to ratify President-elect Joe Biden's 306-232 Electoral College win over President Donald Trump. A group of Republican senators said they would reject the Electoral College votes of several states unless Congress appointed a commission to audit the election results. (Photo by Drew Angerer/Getty Images)
Now playing
02:19
This is what Rep. Gosar was posting days before Capitol riot
John King Magic Wall 0305
PHOTO: CNN
John King Magic Wall 0305
Now playing
02:17
President Biden sending a team to the US-Mexico border
Senior Advisor to the President Jared Kushner  attends a press conference on September 4, 2020, in the Brady Briefing Room of the White House in Washington, DC. (Photo by Brendan Smialowski / AFP) (Photo by BRENDAN SMIALOWSKI/AFP via Getty Images)
PHOTO: BRENDAN SMIALOWSKI/AFP/AFP via Getty Images
Senior Advisor to the President Jared Kushner attends a press conference on September 4, 2020, in the Brady Briefing Room of the White House in Washington, DC. (Photo by Brendan Smialowski / AFP) (Photo by BRENDAN SMIALOWSKI/AFP via Getty Images)
Now playing
02:50
Jared Kushner disappears from Trump's inner circle
Rep john garamendi 0305
PHOTO: CNN
Rep john garamendi 0305
Now playing
02:33
Rep. Garamendi: Any lawmaker involved in Capitol riots ought to be thrown out of Congress
Protesters gather at Lincoln Park to demand the Emancipation Memorial be taken down on June 23, 2020 in Washington, DC.
PHOTO: Tasos Katopodis/Getty Images
Protesters gather at Lincoln Park to demand the Emancipation Memorial be taken down on June 23, 2020 in Washington, DC.
Now playing
03:01
Why some people want this Abraham Lincoln statue taken down
psaki
PHOTO: CNN
psaki
Now playing
00:56
Psaki fires back at Trump testing czar over vaccine claims
PHOTO: CNN
Now playing
03:04
Avlon: Pence's op-ed is 'way worse than Stockholm syndrome'
PHOTO: CNN
Now playing
01:35
See what security looks like outside US Capitol
PHOTO: Gov. Cuomo's office
Now playing
03:35
Gov. Andrew Cuomo addresses women's allegations
Cuomo
PHOTO: Gov. Cuomo's Office
Cuomo
Now playing
00:56
Cuomo says he has no plans to resign
Now playing
04:51
Elected Republican who supports Biden's bill speaks out
President Joe Biden speaks during a meeting about cancer in the Oval Office of the White House, Wednesday, March 3, 2021, in Washington. (AP Photo/Alex Brandon)
PHOTO: Alex Brandon/AP
President Joe Biden speaks during a meeting about cancer in the Oval Office of the White House, Wednesday, March 3, 2021, in Washington. (AP Photo/Alex Brandon)
Now playing
01:20
'Neanderthal thinking': Biden on states lifting mask restrictions
(CNN) —  

Attorney General William Barr and the President’s personal lawyer Rudy Giuliani should be called to testify in the House Intelligence Committee’s impeachment inquiry into President Donald Trump and Ukraine, according to a House Democrat who sits on the committee.

Rep. Mike Quigley told CNN’s Jim Sciutto on Friday that he has “several questions” for Giuliani including whether the President’s personal lawyer has a security clearance.

“Rudy may be the best source of information, because he doesn’t know what he shouldn’t say,” Quigley said, adding that he thinks Barr is “part of that list” of officials the committee will call to testify.

Asked if the committee would enforce subpoenas or hold the two men in contempt should the White House attempt to block their testimony, Quigley said, “I think the committee will take whatever actions are necessary.”

House Speaker Nancy Pelosi, who launched the formal inquiry this week, told CNN on Friday that the intelligence committee will decide who to call as witnesses, also adding that she believes Barr “has gone rogue.”

Illinois Democratic Rep. Raja Krishnamoorthi, another committee member, told reporters on Capitol Hill Friday that it “makes sense” for the committee to invite Barr or Giuliani to testify since “both are obviously central figures.”

“I’m going to probably defer to the chairman on this on who he thinks should come before the committee,” he added.

According to a White House-released transcript, Trump asked Ukrainian President Volodymyr Zelensky during a July phone call to look into former Vice President Joe Biden and his son, Hunter, though there is no evidence of wrongdoing by either Joe or Hunter Biden. Trump asked Zelensky to work with Giuliani and Barr, even suggesting four times during the call that Barr will call Zelensky.

The call was also part of a whistleblower complaint submitted to the Intelligence Community Inspector General that was publicly released Thursday in which the whistleblower alleged that Trump abused his official powers “to solicit interference” from Ukraine in the upcoming 2020 election, and the White House took steps to cover it up.

The whistleblower has tentatively agreed to meet with congressional lawmakers, according to correspondence obtained by CNN.

CLARIFICATION: This story has been updated to clarify that Rep. Quigley was giving his opinion and not speaking for the committee.

CNN’s Alex Rogers and Manu Raju contributed to this report.