Protesting vigorously against BJP leader Dushyant Singh for his comment, Sonia along with her party colleagues forced abrupt adjournment of the House for about an hour.
In a reply to Congress's continuous demand that Foreign Affair Minister Sushma Swaraj must reveal how much money she took from Lalit Modi, Dushyant Singh furiously asked, "Rahul ki mausi ke paas kitna black money hai? (How much black money has Rahul Gandhi's aunt got?)".
Incensed by the remark, the Congress president was heard saying, "kya bola (what did he say)?" While protesting, she addressed Speaker Sumitra Mahajan and said, "What is this?"
Later when the House re-assembled, Parliamentary Affairs Minister M Venkaiah Naidu said no allegation should be made by anybody against any member, particularly an important leader, may it be the Congress President, the Prime Minister or the BJP President.
He said the remark against Gandhi had, in any case, not gone on record.
Earlier, all hell broke loose when a BJP member made certain remark against Gandhi in the context of blackmoney when Leader of Congress Mallikarjun Kharge was speaking on the Lalit Modi controversy.
The Speaker said she was not aware what was said in the din and if there was anything unparliamentary, she would expunge it from the proceedings. Kharge insisted that nothing short of an apology was acceptable.
(With inputs from agency)