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Mallikarjun Kharge raised the alleged ritual in Rajya Sabha.
The ceremony reportedly took place after his August 8 rally in Haldwani.
Kharge said his speech addressed public issues without targeting any religion or community.
He described the incident as an affront to democratic and constitutional values.
More context
Congress alleged that a BJP-linked group conducted the purification ritual because Kharge is Dalit.
J.P. Nadda called the incident unfortunate and regrettable.
Nadda said the BJP does not support or endorse such practices.
He promised an inquiry into the allegations.
The Rajya Sabha Chairman expressed concern and ordered or supported further investigation.
Kharge sought legal action and questioned the implications of untouchability.