Narsingh had tested positive for banned anabolic steroid methandienone which has put his participation in the Rio Games under jeopardy.
"He is innocent, it's a conspiracy," Mumbai Congress President Sanjay Nirupam said, reacting to the doping scandal involving the 26-year-old grappler selected to represent India in the 74kg category.
"Yadav is a victim of wrestling politics in north India. He has been framed," said the former Member of Parliament.
The Wrestling Federation of India should verify the facts from National Anti-Doping Agency as it is a question of India's self-respect, the Congress leader said.