Schiff says he plans to subpoena Giuliani for documents

House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffNunes's facial expression right before lawmakers took break from Sondland testimony goes viral Sondland brings impeachment inquiry to White House doorstep Maloney wins House Oversight gavel MORE (D-Calif.) said in an interview broadcast Sunday night he plans to subpoena President TrumpDonald John TrumpFive takeaways from the Democratic debate As Buttigieg rises, Biden is still the target Leading Democrats largely pull punches at debate MORE's personal attorney Rudy GiulianiRudy GiulianiBiden: Impeachment hearings show 'Trump doesn't want me to be the nominee' Sondland brings impeachment inquiry to White House doorstep FBI sought interview with whistleblower at heart of impeachment probe MORE for documents tied to the Ukraine scandal.

"We’re going to need evidence from Rudy Giuliani," Schiff told "60 Minutes" correspondent Scott Pelley. "And it’s our intention as soon as first thing next week to subpoena him for documents. And there may very well come a time where we want to hear from him directly."

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Schiff's remarks come after he explicitly left the door open in an earlier interview on Sunday to having Giuliani to appear before his panel. "I don't want to commit myself to that at this point," he told NBC's "Meet the Press." "We certainly have to do a lot of work to see what Giuliani has been doing in Ukraine."

Giuliani has been linked to efforts to pressure Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe BidenJoe BidenFive takeaways from the Democratic debate As Buttigieg rises, Biden is still the target Leading Democrats largely pull punches at debate MORE and his son Hunter Biden. A whistleblower report ultimately led to the release of a readout of the call between Trump and Zelensky in which the president appeared to urge the Ukrainian leader to look into both individuals. Biden is currently one of the top candidates in the Democratic presidential primary.

The whistleblower's allegations last week led House Speaker Nancy PelosiNancy PelosiKlobuchar shuts down idea a woman can't beat Trump: 'Pelosi does it every day' Budowsky: Trump destroying GOP in 2018, '19, '20 On The Money: Senate scraps plan to force second shutdown vote | Trump tax breaks for low-income neighborhoods draw scrutiny | McConnell rips House Dems for holding up trade deal MORE (D-Calif.) to launch a formal impeachment inquiry into the scandal, which has since ensnared Giuliani and other individuals connected to the administration. 

Giuliani has repeatedly railed against the Democrats' investigation. On Sunday, he told CNN he would be willing to testifying before the House Intelligence Committee after consulting with Trump.

Capitol Hill is also bracing for closed-door testimony from the whistleblower, whose lawyer confirmed on Sunday evening was still willing to speak with lawmakers. However, according to the lawyer, a date and time had not yet been set for the testimony.