"The BJP is running a malicious, ugly whispering campaign to malign the seniormost Congress leaders...
"We completely reject any such malicious and negative insinuation that the BJP is spreading," Congress in-charge of the communications department Randeep Surjewala told reporters here.
Asked about reports of Nath quitting the party, he said, "Instead of spreading such canards, the BJP should answer to the people of Delhi about corruption in the three civic bodies over the last 10 years."
Whether it was 1977 to 1980, post-1989 to 2004 or as part of the government, Nath continued to serve the party as a worker, leader and the general secretary, he added.
On others quitting the party, the Congress leader said, "The mettle of a leader or a person committed to a political party is tested not when the party is in power but during challenging times.