Rudy Giuliani, President Donald Trump's personal lawyer, is facing an investigation by federal prosecutors into whether his involvement with Ukraine violated federal lobbying laws, The New York Times reported on Friday.

Citing two people familiar with the inquiry, the paper builds on CNN's previous reporting on Thursday that Giuliani's financial dealings with two associates indicted on campaign finance-related charges were under scrutiny by investigators overseeing the case. Law enforcement officials briefed on the matter told CNN that the FBI and prosecutors in Manhattan are examining Giuliani's involvement in the broader flow of money that has become the focus of alleged violations that are at the center of the charges against Lev Parnas and Igor Fruman.

Both people familiar with the inquiry told the Times that the investigation into Giuliani was tied to that of Fruman and Parnas. One of the people told the Times that investigators are looking into Giuliani's attempts to subvert Marie Yovanovitch, the former American ambassador to Ukraine.

A spokeswoman for Geoffrey Berman, the US attorney in Manhattan, declined to comment to the Times.

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