Sources said the BJP is cashing in on the simmering discontent in the ruling party over the Rajya Sabha nominee ( Singhvi) being imposed from outside, along with the restiveness shown by a section of Congress over the cabinet formation and expansion over the last year. 

Mahajan, who filed his nomination in the presence of senior BJP leaders in the forenoon and has a good base in Congress and had switched parties before the Assembly polls in 2022.