A federal investigation into President TrumpDonald TrumpCapitol fencing starts coming down after 'Justice for J6' rally Netanyahu suggests Biden fell asleep in meeting with Israeli PM Aides try to keep Biden away from unscripted events or long interviews, book claims MORE's lawyer Rudy GiulianiRudy GiulianiRoger Stone served with Capitol riot lawsuit during radio interview FEC finds Twitter didn't break law by blocking spread of Hunter Biden story Juan Williams: The toxic legacy of Trump's corruption MORE reportedly covers counterintelligence concerns.
Investigators have looked into potential financial entanglements between Giuliani and Ukrainian figures and counterintelligence concerns linked to those business connections, CNN reported Wednesday, citing unidentified sources briefed on the matter.
One source told the news network that the counterintelligence concerns are centered on whether foreign actors tried to take advantage of Giuliani's business connections to Ukraine to reach the White House.
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.
Giuliani told CNN last week that he was not aware of the investigation into him and that he had not been interviewed by the FBI.
USA Today previously reported that the probe has been going on since at least early this year.
A spokesperson for the U.S. attorney's office in Manhattan declined to comment. The Hill has reached out to the FBI for comment.