The warrant, in addition to seeking other records and documents, specifically identified Semyon and Yasya Shatayner, Ukrainian immigrants who own a large taxi operation in Chicago, according to the source. Cohen is listed as someone who repeatedly loaned money to the Shatayners within the past 10 years, according to public records reviewed by CNN.

The interest in Cohen’s communications with the Shatayners indicates US prosecutors are digging deeper into Cohen’s personal financial dealings, including his taxi medallion business. The warrant, as CNN previously reported, is also seeking records and communications related to efforts to suppress negative information ahead of the presidential election, including communications Trump had with Cohen regarding the infamous “Access Hollywood” tape that captured Trump making lewd remarks about women and surfaced a month before the election.