A pair of Florida businessmen who worked with Donald Trump's lawyer Rudy Giuliani to promote politically-charged investigations in Ukraine were arrested on federal campaign finance charges as they tried to flee the country, it was revealed Thursday. 

Lev Parnas and Igor Fruman, who were each born in former Soviet republics, assisted Giuliani's effort to get Ukraine to investigate his theory about the 2016 elections, and also help Giuliani's effort to dig up dirt on a company tied to the Bidens in Ukraine.

They were arrested at Dulles Airport just before getting on a plane to Vienna, Austria - and a few hours after they were seen lunching with Giuliani at the Trump Hotel in Washington D.C. 

At a federal court hearing in Alexandria, VA, Thursday afternoon federal prosecutors said the pair were a flight risk. 

U.S. Judge Michael Nachmanoff ordered Parnas and Fruman to post $1 million each in bail, surrender their passports and be subject to home detention, among other conditions, before they can be released from jail. 

The two men cultivated ties with a series of top Republican officials. They had dinner with President Trump at the White House and dined with Donald Trump Jr. in 2018.