"We will take appropriate action. The party condemns such a statement which is against the dignity of a woman. This is the real character of BJP leaders," said SP spokesman Rajendra Chowdhury.
"BJP should sack him from the party and also take legal action. A person who has no political courtesy should be taken care of by the BJP," he added.
Vice president of the BJP's Uttar Pradesh unit Singh, who was subsequently relieved from all party posts, had earlier in the day made the derogatory remark against Mayawati in Mau leading to a furore in Rajya Sabha and triggering sharp reactions from all sections of the society.