The court, however, allowed the police plea and remanded Dhananjay to a day's police custody till tomorrow.
The police said that an FIR of rape was lodged against Dhananjay after the woman recently approached it alleging that she was sexually exploited by the MP between 2005-2009.
She was continuously raped by Singh at gunpoint and was threatened with dire consequences if she reported the matter, the police said.
The rape case was lodged against the MP on November 13 at Pandav Nagar police station in east Delhi.
Dhananjay, whose bail application was yesterday rejected by another court here, and his wife Jagriti, a dental surgeon at the R M L Hospital, were arrested on November 5 and are currently in judicial custody in connection with the death of their 35-year-old maid Rakhi Bhadra, a resident of West Bengal.