Schiff says investigators seeking to identify who Giuliani spoke to on unlisted '-1' number

House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffThe Hill's Morning Report - Trump trial begins with clashes, concessions Senate Republicans muscle through rules for Trump trial The Memo: Day One shows conflicting narratives on impeachment MORE (D-Calif.) said late Tuesday that House investigators are looking into who President TrumpDonald John TrumpRouhani says Iran will never seek nuclear weapons Trump downplays seriousness of injuries in Iran attack after US soldiers treated for concussions Trump says Bloomberg is 'wasting his money' on 2020 campaign MORE's personal attorney Rudy GiulianiRudy GiulianiSenate rejects subpoenaing Mulvaney to testify in impeachment trial GOP rejects effort to compel documents on delayed Ukraine aid Citizens United put out a welcome mat for Lev Parnas and Igor Fruman MORE was speaking to on a call with a mysterious "-1" phone number.

Schiff confirmed during an interview with CNN’s Anderson Cooper that House Democrats were looking into the owner of the number, which was included in call logs released by the Intelligence panel on Tuesday. The Democratic chairman declined to say who the number belongs to but suggested a potential link to Trump himself.

"We can’t confirm yet who that '-1' number belongs to, but certainly there was indications in the trial of Roger StoneRoger Jason StoneAuthorities prepared to hand over Roger Stone records to media: report Bannon: 'We need the Republican establishment on board' to reelect Trump 2019 in Photos: 35 pictures in politics MORE that when he was communicating with the president, it would show up in phone records as a '-1' number," Schiff said, referencing the political strategist convicted of witness tampering and making false statements to Congress in November.

“Here you have Rudy Giuliani in communication with the Office of Management and Budget, in communication with the White House, and you also have presidential conduct in the form of tweets and other actions around the timing of different communications,” Schiff added.

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Schiff said further investigation to fill in gaps in the records was still necessary but maintained that "even in the absence of that, the evidence is overwhelming that the president was using Giuliani to coerce Ukraine into these investigations, and that’s documented in text messages [and] witness testimony."

“Rudy Giuliani had only one client in the administration, and that was Donald Trump, so who is he talking to in the course of this smear campaign against [former U.S. Ambassador to Ukraine Marie] Yovanovitch? Who is he talking to in pursuit of these political investigations in Ukraine?” Schiff said, adding that “circumstantial evidence” suggested Giuliani was also in touch with acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneyThe Hill's Morning Report - Trump trial begins with clashes, concessions Senate Republicans muscle through rules for Trump trial Collins breaks with GOP on attempt to change impeachment rules resolution MORE.

The phone records released Tuesday showed extensive communications between Giuliani and the White House as well as other key figures in the impeachment inquiry.

The White House dismissed the Intelligence panel's report as the “ramblings of a basement blogger” and insisted there was no evidence of wrongdoing by the president.