The relationship between President Donald Trump’s personal lawyer Rudy Giuliani and two men charged in a campaign finance scheme is now the subject of a criminal investigation, a bombshell new report claims.

The investigation is being conducted by the FBI’s New York field office and prosecutors in the Southern District of New York — the same district where he served as US Attorney before becoming mayor of New York in 1994, two sources familiar with the investigation told ABC News on Friday.

On Thursday, the FBI arrested a pair of Soviet-born businessmen accused of helping Giuliani dig for dirt on Joe Biden — busting them on charges they funneled foreign cash to Republican politicians to advance their interests and those of a Ukrainian official who wanted then-US Ambassador Marie Yovanovitch fired.

Giuliani told Fox News that the men “logistically helped” him collect evidence against Hunter Biden and connected him with two former Ukrainian prosecutors — but called the timing of their arrest “suspect” and said he would “reveal relevant facts very, very shortly.”

The bombastic businessman could not be immediately reached for comment on Friday evening.

Giuliani remains the president’s attorney but will not be dealing with matters involving the Ukraine investigation, a source close to Trump told CNN.

The Florida-based businessmen, Lev Parnas and Ignor Fruman, were nabbed at Dulles International Airport in Virginia with one-way tickets to Vienna.

They pair have been named as witnesses in the ongoing impeachment inquiry into Trump and have been subpoenaed to testify before several House committees.