The panel is also reviewing whether he directed his congressional staff to work on his election campaigns.
Farenthold is the subject of an investigation into whether he sexually harassed a former member of his staff.
Farenthold has announced he won’t seek re-election to a fifth term. He has denied the allegations of sexual harassment.
The Ethics panel also said Thursday it has created an investigative subcommittee to determine whether Democratic congressman Ruben Kihuen of Nevada engaged in sexual harassment.
Kihuen is already the subject of an investigation, but the subcommittee is necessary for the most serious sanctions in ethics matters.
