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Rudy Giuliani on Thursday denied any allegations that he represented a Ukrainian national, a day after the FBI seized materials from Giuliani as part of an investigation that seems to focus on his work with Ukrainian officials and operatives.

“I never, ever represented a foreign national,” Giuliani, a former federal prosecutor and New York City mayor, told Fox News host Tucker Carlson. “In fact, I have in my contracts, a refusal to do it because from the time I got out of being mayor, I did not want to lobby.”

He said his contracts contain a clause that indicates he will not participate in lobbying or foreign representation, something that he said would be “too compromising.”

His comments come after a former member of the Ukrainian Parliament, Andrii Artemenko, told POLITICO that he had spoken with the FBI about Giuliani. Artemenko declined to elaborate further on his communications with law enforcement.

Giuliani, a longtime confidant of Donald Trump who until last year was the former president’s personal lawyer, said the FBI agents produced a search warrant over a single episode in which Giuliani allegedly failed to register as a foreign agent.

Agents had sought permission last summer to search Giuliani’s apartment, but Justice Department officials declined the request because of rules that limited certain actions in the run-up to the election. Giuliani and those in his circle have framed the situation as a political hit job, although President Joe Biden told NBC News he was not aware of the raids until after they happened.

Giuliani told Carlson on Thursday that he has offered to cooperate with law enforcement for the past two years. He called the warrant “illegal” and “unconstitutional,” adding that a warrant could be issued only if there were evidence he was planning to destroy the materials.

The FBI probe into Giuliani appears to focus on his work related to Ukraine as he tried to find incriminating material about then-candidate Biden’s son Hunter. At the same time, Trump officials signaled to Ukraine’s president that they wanted the country to announce an investigation into Biden’s son or else the U.S. would withhold military aid. That news was the impetus for Trump’s first impeachment.

Earlier Thursday, Trump defended Giuliani in an interview with Fox Business host Maria Bartiromo.

“Rudy Giuliani is a great patriot,” Trump said. “He does these things — he just loves this country, and they raid his apartment. It’s, like, so unfair and such a double — it’s like a double standard like I don’t think anybody’s ever seen before.”