Katie Hill: US congresswoman resigns amid affair allegations

US lawmaker Katie Hill 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.

Why is there an investigation?
The ethics committee launched an inquiry after conservative blog...