(CNN) — Two associates of Rudy Giuliani connected to efforts to dig up dirt in Ukraine on Democratic presidential candidate Joe Biden have been arrested and indicted on criminal charges for allegedly funneling foreign money into US elections.

The charges against the men suggest Giuliani's push on Ukraine and President Donald Trump's receptiveness to it had ties to an illegal effort to influence US politics and policy using foreign funds. The indictment involves two people central to the impeachment inquiry in the House.
 
The two Giuliani-linked defendants, Igor Fruman and Lev Parnas, were detained at Dulles International Airport outside of Washington on Wednesday and are scheduled to appear in court in Virginia at 2 p.m. ET Thursday.
 
Overall, four men were indicted Thursday on two counts of conspiracy, one count of false statements to the Federal Election Commission and one count of falsification of records. The four are alleged in the indictment unsealed by New York federal prosecutors to have conducted a scheme beginning in March 2018 to evade campaign finance laws.
 
Along with Fruman and Parnas, Andrey Kukushkin has been arrested and is expected to appear in court Thursday in the Northern District of California, according to the Manhattan US Attorney's office. The fourth man, David Correia, hasn't been arrested. All four are US citizens, according to the indictment.
 
Parnas was Giuliani's fixer in Ukraine, introducing him to current and former officials as far back as 2018, according to CNN's reporting.
 
Starting in November 2018, Giuliani told CNN, Parnas and Fruman introduced him to former and current Ukrainian officials who provided information that Giuliani claims is damaging to some of Trump's political enemies, including Biden. House Democrats have subpoenaed documents from Giuliani relating to those interactions.