According to sources, Walia, who served as a state minister in the Sheila Dikshit government, was unhappy over party cancelling the ticket given to a woman candidate and replacing her with another candidate for the April 23 MCD elections. 

Several other Congress leaders have alleged irregularities in ticket distribution with former Deputy Speaker and three-time MLA Amrish Singh Gautam also quitting party and joining the BJP. 

There are 272 wards in three municipal corporations in the city, with 104 each in the South and North Delhi Municipal Corporation and 64 in the East Delhi Municipal Corporation, which are going to polls on April 23.