Two letters released by the committee Thursday laid out the details.
The letter about Kihuen said the committee voted unanimously to establish a subcommittee to determine whether the Nevada Democrat “engaged in conduct that constitutes sexual harassment, in violation of House Rules, law, regulations or other standards of conduct.”
A separate letter from the committee announced it would expand the jurisdiction of its investigation of Farenthold to determine whether the Texas Republican violated any rules or laws related to sexual harassment, discrimination or retaliation.
But the letter also said it would investigate “allegations that Representative Farenthold’s staff may have used House resources, including staff time, to benefit his congressional campaigns” and whether he required members of his congressional staff to work on his campaign.
Lastly, the committee wrote it would look into whether Farenthold may have made false statements or omissions in his testimony.
CNN reported that a former Farenthold aide told the Ethics Committee she was pressured into performing campaign-related duties.
The investigation into Farenthold was opened earlier this month after a report by Politico that taxpayers paid $84,000 to settle a sexual harassment claim against him.
Watch: What Got Left in Our Notebooks in 2017