A federal investigation into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's lawyer Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate 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.

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CNN previously reported that the FBI and prosecutors in Manhattan were looking into Giuliani in connection with the case against two of his associates who were arrested on campaign finance charges.

Those two Giuliani associates, Lev Parnas and Igor Fruman, were arrested last week on charges 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.