Trump has denied any wrongdoing, and Giuliani has said repeatedly that nothing he’d done was illegal. Since reports of the phone call have been publicized, Giuliani has taken to cable news to defend himself and his client in rambling — and at times contradictory — tirades.

Giuliani told CNN on Thursday that the whistleblower account was "total nonsense" and he had "no knowledge of any of that crap."

“Rudy Giuliani really ought to stop talking and get a lawyer because, I mean, he is incriminating himself,” Harris said Thursday.

She also suggested earlier Thursday night on MSNBC: “The New York bar association needs to investigate Giuliani and probably disbar him.”

Speaking with Fox News' Laura Ingraham on Thursday, Giuliani laughed at Harris' remarks and called her a "phony." He repeated past claims that the State Department requested he meet with Zelensky's aide and that the interaction was legitimate.

"What they're really trying to do is to intimidate me and to discredit me because I'm doing such an effective job of showing what phonies they are," Giuliani said.

Harris also denounced Trump’s response to the reports. The president said on Thursday that he wanted to find out who gave the information to the whistleblower, adding that in the “old days,” “spies and treason” were handled a “little differently.”

“He sounds like a criminal,” Harris said on Thursday. “Who snitched? Who gave up the goods? Let’s find out who gave up the goods on us and make sure there’s a consequence and it’s serious, and let that be a lesson to everybody else. And it sounds like it’s straight out of some bad drama.”

Reports of the exchange between Trump and Zelensky have prompted deep concern among intelligence officials and led to calls for impeachment from previously skittish Democrats. Harris had already called for Trump’s impeachment in the light of special counsel Robert Mueller’s investigation into Russian interference in the 2016 presidential election.