Pranab Mukherjee's apology came soon after TDP leader Namo Nageshwar Rao expressed regrets over heated exchanges in the House as he and his party colleagues stormed the well.
"Madam speaker, first of all I would like to express my regret and apology because I lost my cool and temper with one of my young colleagues, which I should not have done. But nonetheless, it has happened on the floor of the House. I sincerely apologise to the House," Mukherjee said.
However, Rao said Mukherjee was "a very senior leader and therefore whatever has happened, we are sorry".
The House was shocked when an agitated TDP member N Sivaprasad, questioned as to why his party should stick to
rules. Speaker Meira Kumar, as also leader of the Opposition Sushma Swaraj, tried to pacify the protesting members.