Investigators say fingerprints on an envelope used in the smear campaign against Brian Beute led them to a local tax collector, Joel Greenberg. That investigation subsequently led to Greenberg’s friend, U.S. Rep. Matt Gaetz, who is now the subject of a probe into whether the congressman and tax collector paid women or offered them gifts in exchange for sex and whether one of them was underage.

Gaetz has denied the allegations and insists he will not resign his seat in Congress. Greenberg has pleaded not guilty to 33 charges, though his attorney and prosecutors said last week they are working toward a plea deal.