BJP's Abhishek Kumar Sinha withdrew from the Bankipur bypoll citing family reasons. The party then fielded Neeraj Kumar Sinha as its new candidate for the contest. Opposition parties claimed the BJP was nervous about a potential defeat in the upcoming election.
Source: [Times of India](https://timesofindia.indiatimes.com/india/why-bjp-replaced-its-bankipur-bypoll-nominee-before-face-off-with-prashant-kishor/articleshow/132324929.cms)