"They (BJP) should also follow some examples of people who come to Parliament and put the case to Parliament. They can't change the rules and they can't lay down the rules," Khurshid told reporters outside Parliament House.
He was reacting to a question on BJP's demand that Singh, who was the coal minister when coal block allocation was made, should quit just like former telecom ministers A Raja and Dayanidhi Maran, who had to resign after their names cropped up in the 2G scam.
Attacking the BJP for disrupting Parliament proceedings, he said, "You have to follow the rules of Parliament and you have to follow the rules in the games of democracy and sadly they (BJP) want to keep changing the rules and shifting the goal post.
This is not acceptable."
Khurshid said people are "screaming for Parliament to function and the opposition will not hear" as they are not willing to listen to the truth and "it is absolutely irresponsible... Putting Parliament in peril, putting a question mark on Parliament, putting the reputation of Parliament at stake because you don't want to hear the inconvenient truth."
Parliament has been in turmoil since Tuesday with BJP members demanding resignation of the Prime Minister over CAG's findings on the issue of extension of undue benefits to the tune of Rs 1.86 lakh crore in allocation of coal blocks.