"I have already shared with Soniaji all the research that I have done on her. She has given me the go-ahead but asked me to hold on until the next general elections are out of the way," Mundhra said.
Mundhra's plans to film the real life story about how the late Prime Minister Rajiv Gandhi and Sonia Maino first met in England as students were stalled in 2007 amid protests by a section of the Congress party.
"All that has now been sorted out," said the filmmaker, who is in the Cannes Film Market this year with Shoot on Sight, yet another film inspired by actual events.
Mundhra was on the verge of making film soon after completing Provoked, which had Aishwarya Rai playing a real-life battered woman who ended up killing her abusive husband.
Shoot on Sight, starring Naseeruddin Shah, Greta Scacchi and Om Puri, narrates the story of a Muslim commander of the Scotland Yard, Tariq Ali, who must stand up for his values and beliefs in a London shaken by the 7/7 terror strike in a tube station.
The protagonist of the film is modelled on Tariq Gafoor, the Pakistan-born officer who became Scotland Yard's most visible face on television in the aftermath of the underground blasts.