Multiple witnesses have been contacted by investigators for interviews and documents as part of the House Ethics Committee's recently reopened probe into Rep. Matt Gaetz over allegations that include sexual misconduct, illicit drug use and potential public corruption, according to sources. One witness with ties to Gaetz recently spoke with investigators and handed over documents requested by the committee, sources tell ABC News. Other witnesses in the Gaetz investigation have also received letters requesting they speak with the committee, sources said.