New Delhi, Jan 10 (Agencies): Congress on Monday went on the offensive against BJP over its frontal attack against Sonia Gandhi and Prime Minister Manmohan Singh, accusing the main opposition of personalising politics and degrading the quality of public life.

In a tough message to BJP, party general secretary Janardan Dwivedi said,"Does BJP want an investigation into allegations levelled against its leaders from time to time by the very persons who were at some point of time close to them....No body knows who will stand where if fingers are raised on the top leadership of any party by linking distant relations."

He also advised the opposition party to "mend its language and the style of politics" saying this will do a great deal of good to the country as "larger parties also have larger responsibilities in a democracy".

Talking on condiiton of anonymity, a senior party leader recalled the spate of allegations levelled by Jansangh and BJP deserters against their own top leadership starting from the days of Balraj Madhok.

At the AICC briefing, party spokesperson Manish Tewari went hammer and tongs against the opposition party dubbing its political resolution adopted at Guwahati a "bundle of lies" fit to be dumped into a "political dustbin".

"BJP's resolution is a bundle of lies. It smacks of frustration and the only right place for it is political dustbin," Tewari said.

Dwivedi said that parties or leaders that got into personal attacks never succeeded. "Since freedom, whoever has done the politics of personal attacks has not succeeded. There were people who levelled baseless allegations on Jawahar Lal Nehru, Indira Gandhi and Rajiv Gandhi but finally Congress emerged victorious and those levelling allegations failed."

Senior Congress leaders are of the view that the more personalised BJP's attack gets, the heavier would be the opposition party's loss in terms of people's sympathy.

"After remaining in government for six years, this trait of BJP is not good. They are not being able to have patience for UPA 2 to complete its four years in office," Dwivedi said.

By taking politics down to such level, BJP will hugely damage public discourse in the country, he said.

At the party briefing, Tewari said, "It's high time BJP learns that the way to do politics is not calumny campaign and innuendos".