Mayawati, a former Chief Minister of the state, said Singh alias Raja Bhaiya moving around scot free would weaken the case of the killing of Deputy Superintendent of Police in Pratapgarh district.
DSP Zia-ul-Haq was killed by a mob in Pratapgarh on Saturday when he had rushed there after a village head was shot dead over a land dispute. The slain officer's wife had accused Raja Bhaiya for the attack.
She said the protests by Muslim students at the Aligarh University and Allahabad University were valid as an FIR has been filed against the former minister but he has not been arrested yet.
On her demand for imposition of President's Rule in UP, Mayawati said it was upto the Centre to take a decision.
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Meanwhile, SP member Naresh Agarwal said the party had no objection to the conduct of a second post-mortem of the slain DSP.
Agarwal said UP Chief Minister Akhilesh Yadav has already recommended a CBI probe into the incident.