Washington (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."

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