Congress leader and Union steel minister Beni Prasad Verma has called the Bharatiya Janata Party's (BJP) prime ministerial candidate Narendra Modi a "goon" of the Rashtriya Swayamsevak Sangh (RSS).
He also attacked BJP president Rajnath Singh calling him a slave.
Addressing a rally in his constituency in Gonda, Verma said Mahatma Gandhi was killed because of the RSS and the BJP.
"Narendra Modi is a gunda of the RSS and Rajnath (Singh) is his slave," he added.Video | Politicos slam Beni Prasad for anti-BJP remarks
The "gunda" remark comes a day after Verma alleged the BJP and the RSS have been sold out in the hands of Modi.
"The BJP is insulting its senior leaders. The RSS and BJP have been sold out in the hands of Narendra Modi," he had said.
Poll: Has BJP become a one-leader party under Narendra Modi?