Litman warned that the investigation is close to the New York City mayoral race, in an interview on Wednesday.

Rosen has been a producer for several CBS News podcasts, including "The Takeout," "The Debrief" and "Agent of Betrayal: The Double Life of Robert Hanssen." The Justice Department has opened an investigation into former New York Gov.

Cuomo, who's running for New York mayor, was a major opponent of President Donald Trump during his first term in the White House.