House investigators probing Rep. Matt Gaetz contact ex-associate Joel Greenberg: Sources

House investigators probing Rep. Matt Gaetz have reached out to Joel Greenberg, a one-time close friend of Gaetz who pleaded guilty to federal charges, sources say.

The House Ethics Committee investigating Rep. Matt Gaetz has reached out to Joel Greenberg, a one-time close friend of Gaetz who was sentenced to 11 years in prison after pleading guilty to federal charges, sources told ABC News.

The probe, which was reopened last summer, continues to ramp up, as the committee in recent weeks has contacted multiple new witnesses as part of its ongoing investigation into the Florida congressman, sources said.

Among the witnesses contacted is the woman who allegedly had sex with the congressman as a minor, sources familiar with the committee's work told ABC News. That development was first reported by CNN.

Sources told ABC News that in recent days, in addition to focusing on possible lobbying violations by Gaetz, the Ethics Committee has reached out to witnesses who were questioned as part of the Justice Department's sex trafficking investigation into the Florida congressman.