US lawmaker Katie Hill, who is bi-sexual, has announced her resignation from Congress, following allegations that she had an affair with a Capitol Hill aide.
The California Democrat, who has denied the claim, said she was stepping down with a “broken heart”.
“I believe it is the best thing for my constituents, my community, and our country,” she wrote on Twitter.
The resignation came days after she was placed under investigation by the House of Representatives Ethics Committee.
The ethics committee launched an inquiry after conservative blog RedState reported allegations that Ms Hill had an affair with one of her congressional aides, a man.
The same blog separately reported claims that Ms Hill had also engaged in a three-way consensual romance with a female campaign staff member and her husband. It published naked images of the politician.
She has asked police to investigate the nude photos being published online.
Hours before the congressional inquiry was launched on Wednesday, Ms Hill sent a letter to supporters acknowledging a “relationship” with a female 2018 campaign staff member. She described that affair as “inappropriate”.
The relationship that Ms Hill acknowledged took place before she was elected, so it fell outside congressional rules on personal relationships.