Virginia Gov. Terry McAuliffe, a longtime confidant of Bill and Hillary Clinton, is under federal investigation over potentially illegal campaign contributions.

The probe, first reported by CNN, involves a $120,000 donation from Chinese businessman Wang Wenliang through his U.S. businesses. U.S. election law prohibits donations by foreign nationals to political races.

McAuliffe denied any allegations of wrongdoing in remarks this morning, saying the donor was "fully vetted."

Fox News senior judicial analyst Judge Andrew Napolitano pointed out on America's Newsroom that this investigation is being carried out by the same team looking into public corruption allegations against Hillary Clinton.

Napolitano said the FBI probe, which is separate from the investigation into her private email server, is looking at whether Clinton made decisions as secretary of state to benefit her husband and the Clinton Foundation.

"It is in that connection that Terry McAuliffe's name came up because he was the nominal head of the foundation during that period," said Napolitano. 

The judge said it would not take a year for the feds to figure out whether Wang was a lawful U.S. resident, adding "there's obviously more there than meets the eye."

Napolitano noted that investigators are also digging into the governor's tax returns. 

Watch Judge Napolitano's analysis above and hear from Peter Schweizer, author of "Clinton Cash," below.