The House Ethics Committee launched an investigation into Rep. Jimmy Gomez (D-CA) over sexual misconduct allegations, making him the latest member to face investigation as scandal roils Capitol Hill. Gomez is under investigation for allegedly kissing a congressional aide outside of a party in Washington.

The House Ethics Committee told CNN they had begun the early stages of an investigation after an April New York Post story alleged the congressman was seen kissing the aide. Gomez, who faces a primary from Justice Democrats-backed Angela Gonzales-Torres in Tuesday’s primary, said he did not violate any House ethics laws but acknowledged he had made mistakes in his marriage.