In a statement, Ethics Committee Chairman Ted Deutch (D-Fla.) and Rep. Kenny Marchant (Texas), the panel's ranking Republican, said that Gaetz declined their request to appear before the committee for an in-person interview in May.
The Ethics Committee said it told Gaetz that it wouldn't be able to resolve the ethics complaint against him without his testimony and warned that if it couldn't dispose of the complaint by June 24, the rules would require formally opening an investigative subcommittee to review the allegations.
Gaetz defended his refusal to cooperate with the investigation.
"If members of Congress want to spend their time psychoanalyzing my tweets, it’s certainly their prerogative. I won’t be joining them in the endeavor," Gaetz said in a statement Friday.