The Speaker pulled up Mann when he appeared before her at around 11.10 am, sources in her office said.
As the issue rocked both Houses of Parliament with MPs demanding strong action against him, including his disqualification, the Lok Sabha member from Sangrur told Mahajan that he had made the "mistake inadvertently" and that he had no intention of compromising the security of Parliament.
Mann said when he was coming to the House to attend Zero Hour, he had made the video "by mistake" as "I did not know that it is against the rules".
However, the Speaker, who saw it as "grave misconduct", was not impressed by his apology as she felt it was not enough.
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She said it was a matter "too serious" considering that Parliament has been attacked by terrorists once.
Mahajan later told reporters that if it had been a matter concerning the proceedings inside the House, she would have taken action immediately.
But since it is a matter relating to the Parliament complex, she would consult political parties for "appropriate action", she said.
The Speaker said this matter is above ethics or privilege as it concerns the security of Parliament and MPs who are the representatives of the people.
The sources said the Speaker saw the controversial video film last evening and was shocked, wondering if every MP indulges in such an act, how then the dignity of Parliament could be maintained.
Before Mahajan came to the House, a number of MPs from Akali Dal, BJP and Shiv Sena met her and demanded action against Mann, the sources said.
After her meeting with Mann, the Speaker held consultations with Deputy Speaker M Thambidurai and some other leaders to take suggestions on the matter.
Due to the uproar, both Houses could not transact any business and had to be adjourned for the day prematurely.