Gaetz ally expected to plead guilty, cooperate with investigators in sex-trafficking probe

Joel Greenberg said that he and others had paid a 17-year-old girl for sex.

Greenberg does not directly name Gaetz in the papers, but he admitted that he and others who are not identified in the document had paid a 17-year-old girl for sex and that he "introduced the minor to other adult men, who engaged in commercial sex acts."

Greenberg will plead guilty to six of 33 federal charges he was facing, but the government states they reserve the right to prosecute him on the other charges if he violates any terms of the cooperation deal.

Greenberg is set to appear at a "change of plea" hearing Monday morning in federal court in Orlando.

Gaetz has vehemently denied any wrongdoing, including having sex with an underage girl.