Law enforcement officials briefed on the matter told the news network that the attorney’s dealings with the associates are under scrutiny.
Giuliani said that he was not aware of such scrutiny.
Parnas and Fruman were arrested Wednesday on allegations that they violated campaign finance laws in order to give money to Republican committees including a $325,000 contribution in 2018 to a pro-Trump super PAC called America First Action.
Parnas and Fruman have also helped Giuliani with efforts to investigate Democratic presidential candidate Joe Biden, although the charges appear to be unrelated to Giuliani’s work in Ukraine.
The Hill has reached out to the FBI for comment and a representative for the U.S. Attorney’s Office in Manhattan declined to comment.