BJP alleged links between Lalit Modi and the Gandhi family while the Congress said it was a case of 'chhota Modi' helping 'bada Modi' (Narendra Modi) with lies".
Lalit Modi had last night tweeted, "Happy to meet the Gandhi family... In London. I had run into Robert and Priyanka separately in a restaurant".
That invited a sharp attack from the opposition, which said that Lalit Modi's tweets were a case of "chhota Modi" helping "bada Modi" (Prime Minister Narendra Modi) through "lies".
Seeking to turn the tables on Congress, BJP spokesperson Sambit Patra said, "Today's big revelation is the fact that Lalit Modi had met the Gandhi family. Only yesterday he met Priyanka Gandhi and Robert Vadra. Why have they met him?
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"Let me categorically put today that the issue is about Lalit Modi and Gandhi family... BJP demands Sonia Gandhi make a statement why the Gandhi family has been in touch with Lalit Modi all these years."
"Who was preventing them? The Gandhi family," he alleged. "The matter starts and ends at the door of 10, Janpath."
But lashing out at BJP over the charges, Congress said that running into anybody in a restaurant was not a crime and that Lalit Modi was working at the behest of BJP to divert attention to "non-issues".
Congress's chief spokesperson Randeep Surjewala said that BJP should tell its "black money stooges to not rely on red-herrings" to divert attention from the issue.
"I can say with full responsibility that neither Priyanka Gandhi nor Robert Vadra ever interacted with Lalit Modi socially. If you see somebody in a restaurant, it is not a crime. 'Chhota Modi' is helping 'bada Modi' with lies.
"It is a diversionary tactic of BJP to turn the attention towards non-issues. The government should speak about real issues and not hide behind Lalit Modi," Surjewala told reporters.
Reiterating his party's demand for the sacking of Swaraj and Raje, Surjewala said they had helped a fugitive accused of "fraud of gigantic proportions".