In recent weeks, House Ethics Committee investigators have conducted a string of interviews behind closed doors with numerous women who were witnesses in the yearslong Justice Department sex trafficking investigation into Rep. Matt Gaetz, multiple sources familiar with the committee's work tell ABC News.

Investigators have interviewed at least half a dozen women who allegedly attended parties where the Florida congressman was also present and who were paid by Joel Greenberg, Gaetz's one-time close friend. Greenberg was sentenced in 2022 to 11 years in federal prison after pleading guilty to multiple charges including sex trafficking a minor and introducing the minor to other "adult men," sources tell ABC News.

In the interviews, which have previously not been reported, some witnesses have been shown Venmo payments they allegedly received from Gaetz and asked if those payments were for sexual activities, sources said. Some of the witnesses have been subpoenaed by the committee while others have agreed to cooperate, according to the sources.