A Florida man wanted in a campaign finance case involving associates of Rudy Giuliani is in federal custody after flying Wednesday to Kennedy airport in New York City to turn himself in, federal authorities said.

David Correia, 44, was named in an indictment with two Giuliani associates and another man arrested last week on charges they made illegal contributions to politicians and a political action committee supporting Donald Trump. Giuliani, the former New York mayor, is Trump’s personal lawyer.

All the other defendants in the case were already in custody.

Prosecutors said Correia, who owns a home with his wife in West Palm Beach, was part of efforts by co-defendants Lev Parnas and Igor Fruman to leverage outsized political donations to Republican candidates and committees as part of an effort to advance their business interests.

Both Parnas and Fruman have a history of business dealings with Giuliani.

Prosecutors said that, among other things, the pair made campaign contributions with the intent of lobbying US politicians to oust the country’s ambassador to Ukraine. At the time, Giuliani was trying to get Ukrainian officials to investigate the son of Trump’s potential Democratic challenger, Joe Biden.

Correia is accused of conspiring with the other defendants, including Ukrainian-born US citizen Andrey Kukushkin, to make political donations to local and federal politicians in New York, Nevada and other states with the aim of trying to get support for a new recreational marijuana business.

All four defendants were expected to appear on Thursday in federal court in Manhattan.

Separately, the investigation into Giuliani’s Ukrainian business dealings are reported to have triggered a broader set of counterintelligence concerns within the FBI than previously known, CNN has reported.

Kenneth McCallion, a New York lawyer who has represented several Ukrainian clients including former Ukraine prime minister Yulia Tymoshenko, has said counterintelligence agents approached him asking about Giuliani’s ties to Parnas and Fruman earlier this year.

The investigation is understood to focus on possible foreign influence operations designed to take advantage of Giuliani’s Ukrainian ties to make inroads with the White House.

“I was just asked whether I or any of my clients knew of any dealings that these two guys had with Giuliani,” McCallion told the network. “They were on the radar with regard to possible counterintelligence issues.

McCallion added that he “was asked a lot of questions by FBI and other counterintelligence investigators who were looking at Giuliani’s comings and goings in Ukraine and business dealings”.

Giuliani, who has said Parnas and Fruman are his clients, has said he had “no such knowledge” of a federal inquiry involving him.

Correia, the fourth man arrested in the investigation, is listed as the registered agent for a Florida corporation tied to a series of wire transfers prosecutors allege was part of an elaborate effort to hide the true source of funds used to make the donations.

He posed with then congressman Pete Sessions in a 2018 photo taken inside the Texas Republican’s Capitol Hill office that Parnas posted on social media with the caption “Hard at work !!”

The Associated Press reported last week that Sessions fits the description in the indictment of a congressman who prosecutors allege was part of a coordinated effort to remove the US ambassador to Ukraine.

The arrest comes as a former top aide to secretary of state, Mike Pompeo, told impeachment investigators on Wednesday that he resigned because he was upset that the Trump administration had overridden Ukraine policy.

According to three sources who briefed the New York Times on House intelligence committee depositions, the aide, Michael McKinley, described his frustration with the politicization of the department under President Trump.

McKinley is the latest in a string of diplomats and officials who have described to impeachment investigators that they pushed aside as Trump exercised his own agenda on Ukraine, including efforts to have former vice-president Joe Biden and his son investigated.