RPN Singh, one of the Congress's most prominent leaders in Uttar Pradesh, has quit the party and is set to join the BJP ahead of next month's election in the state.
Soon after posting his resignation letter to Sonia Gandhi on Twitter, RPN Singh announced his move with a post announcing a "new beginning" under the leadership of Prime Minister Narendra Modi, BJP president JP Nadda and Home Minister Amit Shah.
RPN Singh, who is from eastern UP's Kushinagar, was among the Congress' biggest leaders in the state and was on the list of star campaigners for the party announced just yesterday.
After changing his Twitter bio this morning, dropping his Congress credentials, Mr Singh made it official by first posting a resignation letter addressed to Sonia Gandhi on Twitter.
Uttar Pradesh, Goa, Manipur, Punjab, and Uttarakhand will vote over seven phases starting February 10, with counting of votes scheduled for March 10.
A total of 690 Assembly constituencies will vote over the next two months, with the maximum in UP (403 seats) followed by Punjab (117), Uttarakhand (70), Manipur (60) and Goa (40).