Just hours after being issued a subpoena from top congressional Democrats, Rudy Giuliani appeared on Fox News to defend his involvement with Ukraine, actions that have become central to an impeachment inquiry of President Donald Trump.

Trump’s personal attorney appeared on Sean Hannity’s program as part of his latest effort to distance himself from the political whirlwind surrounding Trump’s July 25 call with the Ukrainian president.

During the “Hannity” segment, Giuliani appeared to question the motives behind the subpoenas while defending his communications with officials in Ukraine about investigating former Vice President Joe Biden, a top Trump rival in the 2020 presidential campaign. He also reminded viewers that he was a professional lawyer as he pushed unfounded conspiracy theories targeting a spate of his boss’s political rivals.

“These people are such intellectual heavyweights, I don’t know if I could handle Schiff,” Giuliani said Monday, appearing to joke about Rep. Adam Schiff (D-Calif.), the chair of the House Intelligence Committee who recently sent him a subpoena.

Giuliani went on to push unfounded claims about the Biden family, Trump’s 2016 political rival Hillary Clinton and former President Barack Obama.

“Wake up, Democrats. You are covering up corruption, and by the time this is over, you’re going to be the party of corruption,” Giuliani said. Earlier in the show, he noted that lawmakers “seem to forget that I’m a lawyer. If I were defending a terrorist, they’d be going crazy that I was called before a committee.”

Giuliani begins his Hannity interview by pushing a conspiracy theory about Obama and Hillary Clinton colluding with Ukraine to dig up dirt on Trump in January 2017 -- which doesn't make much sense since the presidential election had come and gone by then pic.twitter.com/08yHvUYcgJ — Aaron Rupar (@atrupar) October 1, 2019

The chairs of multiple House committees subpoenaed Giuliani and three of his associates Monday as part of the inquiry, demanding he produce communications and other documents related to his work for the president. The subpoena pertains to material from Jan. 20, 2017, the day before Trump’s inauguration, to the present.

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“Our inquiry includes an investigation of credible allegations that you acted as an agent of the president in a scheme to advance his personal political interests by abusing the power of the office of the president,” said the letter, signed by Schiff and two other Democratic congressmen: Eliot Engel (N.Y.), chair of the House Foreign Affairs Committee, and Elijah Cummings (Md.), chair of the House Oversight and Reform Committee.

Giuliani must comply with the subpoena by Oct. 15, although the former New York City mayor has already pushed back on its merits, claiming on Twitter that it raised “significant issues concerning legitimacy.”

I have received a subpoena signed only by Democrat Chairs who have prejudged this case. It raises significant issues concerning legitimacy and constitutional and legal issues including,inter alia, attorney client and other privileges. It will be given appropriate consideration. — Rudy Giuliani (@RudyGiuliani) September 30, 2019

House Democrats are investigating Giuliani’s role in the unfolding scandal over Trump’s call with Ukrainian President Volodymyr Zelensky as part of their impeachment inquiry.

During the July conversation, Trump repeatedly pressured Zelensky to investigate Biden and his son Hunter Biden, who served on the board of a Ukrainian energy company for five years. A reconstruction of the call released last week showed Trump asking Zelensky for a “favor” shorty after Zelensky brought up millions in military aid the U.S. had appropriated for Ukraine.

Neither Biden has been accused of any wrongdoing, despite Giuliani’s claims.

Giuliani appears to be one of the central figures related to that favor, which Democrats have called an unprecedented quid pro quo for political dirt. The attorney is mentioned multiple times in a formal whistleblower complaint about the call, and he has admitted in television interviews that he met with Ukrainian operatives. But Giuliani has recently said he did so at the behest of the State Department. Trump has also denied any impropriety and moved to discredit the unnamed whistleblower.

Secretary of State Mike Pompeo has also been issued a subpoena by House Democrats.

Giuliani’s whirlwind media appearances have prompted frustration from Democrats in recent days, including from the Biden campaign. The former vice president’s staff recently asked news executives to stop booking Giuliani on their shows, saying he was using the appearance to spread “false, debunked conspiracy theories.”

“Giuliani is not enlightening your viewers in any way. He’s not offering a unique or informed perspective,” the Biden camp wrote in the letter last week. “He’s certainly not introducing new facts, since his relationship with the truth is casual at best.”

House Democrats have, however, pointed to the lawyer’s own statements on CNN to back up their request for the subpoena.

“You stated more recently that you are in possession of evidence ― in the form of text messages, phone records, and other communications ― indicating that you were not acting alone and that other Trump Administration officials may have been involved in this scheme,” they wrote.

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This article originally appeared on HuffPost.