Earlier in the day, Congress leader PC Chacko challenged Janata Party president Subramanian Swamy to prove allegations of wrongdoings against Sonia Gandhi and Rahul Gandhi.

Addressing a press conference here, Chacko said that the Congress is ready to engage in a legal battle with Swamy over the false charges that Rahul and Sonia Gandhi had taken over a company and the building that published the now-defunct National Herald newspaper, which was once a public trust created by former prime minister Jawaharlal Nehru.Chacko said: "We are now ready, the person (Swamy) who made this allegations should prove it. We have sent a letter from Rahulji's office and that amounts to legal notice.'