Rudy Giuliani is under scrutiny for his financial dealings with two men who were arrested Wednesday on campaign finance-related charges, according to law enforcement officials briefed on the matter.

Soviet-born Lev Parnas and Igor Fruman reportedly donated hundreds of thousands of dollars to a Trump-allied Super PAC, with Parnas helping Giuliani build connections with Ukrainian prosecutors.

The pair was arrested at Dulles Airport outside of Washington D.C. holding one-way international ticket.

The FBI and prosecutors in Manhattan are investigating Giuliani’s possible involvement in the handling of Parnas and Fruman’s money.

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Giuliani said he has not been interviewed by the FBI and is unaware of any investigation into his finances.

Parnas and Fruman introduced Giuliani to Ukrainian officials who provided the Trump attorney with information that the he claims is damaging to some of President Donald Trump‘s political rivals, including former Vice President Joe Biden.

The two men were indicted for giving more than the maximum donation to an unnamed congressman.

The impeachment inquiry into Trump focuses on the president’s dealings in Ukraine and whether he abused his political power to pressure the Ukrainian government to investigate Biden. Giuliani, Parnas and Fruman have all received House subpoenas for documents related to the investigation.