Lok Janshakti Party MP Prince Paswan has been booked under rape charges by the Delhi Police, officials said on Tuesday.
A senior police officer said the case was registered on the direction of court.
Prince Paswan, who is a cousin of Chirag Paswan, has been accused of rape by a woman, who is reportedly an LJP worker. She had complained to the police in Delhi's Connaught Place three months ago that she had been raped and threatened by Prince Raj, an MP from Samastipur in Bihar.
"The court's direction came on Thursday and a case has been registered under relevant sections at the Connaught Place Police Station," the officer said.
On June 17, Prince Raj had tweeted a statement denying what he called the allegations of "a certain woman making defamatory statements" claiming harassment and abuse.