Congress leader in the Lok Sabha Mallikarjun Kharge hoped that the government will institute a judicial probe into the incident.
"An inquiry by police will be one-sided," Kharge said.
He urged the government to spell out relief steps for farmers in terms of loan waiver, compensation and minimum support price.
Trinamool Congress MP Saugata Roy also demanded a judicial inquiry.
"The home minister should order a judicial inquiry as to why nobody reacted and the drama was played out in full view," he said.
Gajendra Singh, a farmer from Rajasthan whose crops were destroyed by unseasonal rain, hanged himself from a tree here during the AAP rally on Wednesday, held to protest against the controversial land ordinance.