Ex-Matt Gaetz associate cooperating in House Ethics investigation: Sources

Joel Greenberg, a one-time close friend of Rep. Matt Gaetz who was sentenced to 11 years in prison after pleading guilty to charges including federal sex trafficking, is cooperating with the House Ethics Committee probe into the Florida congressman, sources familiar with the committee's work tell ABC News.

Greenberg, who is currently in prison, served as a top witness in the Justice Department's years-long probe into Gaetz that concluded with the DOJ's decision not to bring charges against him.

Greenberg has been in contact with the Ethics Committee for weeks and has provided documents related to the case, sources told ABC News.

The New York Times was first to report Greenberg's cooperation with the committee.