Congress Parliamentary Party will decide on the appropriate motion to be brought against the Prime Minister, party's chief spokesman Randeep Surjewala told reporters.
He was queried about indications by Mallikarjun Kharge, the Congress leader in Lok Sabha, to bring a privilege motion against Modi in the House.
Surjewala attacked the Prime Minister for levelling "baseless" allegations against the Congress chief and accused him of indulging in "petty mud slinging". He claimed that Modi's action is "blinded by his insatiable desire to seek revenge against the Congress leadership".
In Rajya Sabha, Congress MP Shantaram Naik has already given a notice of breach of privilege against the Prime Minister and Defence Minister Manohar Parrikkar to Chairman Hamid Ansari on a day Congress created a ruckus in Parliament against Modi's comments at the election rally in Thiruvananthapuram.
Modi had said: "Madam Soniaji, aap ki ye himmat. You and Congress leaders are making statements that false allegations are being made against you. Did Modi or the Modi government in the last two years even once take the name of Congress in the helicopter deal?