Federal agents execute search warrants on Rudy Giuliani's Manhattan home and office

Giuliani, who served as former President Donald Trump's personal lawyer, has been the focus of an investigation concerning his activities in Ukraine, including whether he conducted illegal lobbying for Ukrainian officials while he pursued an investigation linked to Trump's primary political rival, President Joe Biden, CNN has reported. Giuliani hasn't been charged and has denied wrongdoing.

It is unusual for prosecutors to execute a search warrant on a lawyer, although Manhattan federal prosecutors have done so before, most notably in recent years against another former lawyer for Trump, Michael Cohen.

On Wednesday afternoon, an attorney for Giuliani, Robert Costello, said the warrant described an investigation into possible violation of foreign lobbying laws and that it sought communications between Giuliani and people including a former columnist for The Hill, John Solomon.

A spokesman for the Manhattan US Attorney's office declined to comment. The New York Times was first to report the search.

A search warrant for a lawyer like Giuliani would require sign-off by the highest levels of the Department of Justice, likely by Deputy Attorney General Lisa Monaco or the acting deputy attorney general who served prior to her confirmation, according to departmental guidelines.

The Times reported that investigators seized Giuliani's electronic devices, according to one person with knowledge of the matter.

The New York federal prosecutors leading the investigation into Giuliani have previously sought a search warrant for him, raising the prospect last year of seeking one for his communications, but they were met at the time with resistance from Justice Department officials in Washington over the strength of their evidence, CNN has previously reported.

Then-Deputy Attorney General Jeffrey Rosen, along with other officials at Justice headquarters and the US attorney's office in Manhattan, decided not to make a final decision, CNN reported, in part because there would soon be a change in the administration.

The New York federal prosecutors wanted to seize Giuliani's devices when they first sought to execute the search warrant last year, CNN previously reported.

Giuliani has been under scrutiny by Manhattan federal prosecutors since early 2019. The inquiry has explored whether Giuliani may have been engaged in undisclosed foreign lobbying for Ukrainian officials when he sought the ouster of the US ambassador to Ukraine as well as an investigation into the Bidens for his own personal benefit at the same time he was pursuing those efforts as Trump's attorney.

In 2019, two Giuliani associates, Lev Parnas and Igor Fruman, were indicted on campaign finance charges stemming from an alleged straw donor scheme. Parnas and Fruman met with Giuliani, helping introduce him to Ukrainian officials. They have pleaded not guilty.

Guilinani is also facing other legal exposure for his role in the 2020 election. The election technology company Dominon sued Giuliani in January for defamation after he spread baseless conspiracy theories about election fraud on his podcast and during TV appearances. In the lawsuit, the company focused on how Giuliani continued to claim without evidence that Dominion aided election fraud even after he received a cease-and-desist letter. Guiliani said at the time he would "investigate a countersuit against" Dominion.

Guiliani is also likely to face scrutiny from Fulton County District Attorney Fani Willis, who is investigating Trump's efforts to influence Georgia's election results. While the crux of Willis' investigation is Trump's efforts to meddle in the state's election, she is also examining Trump allies who may have assisted him in those efforts. One area Willis is exploring: whether Giuliani may have violated the law by making false statements about voting in Georgia in front of the state legislature, according to a person familiar with the investigation.

This story has been updated with additional information.