Party sources said Singh is likely to be expelled from the party because as per BJP constitution, any partyman contesting against official candidate is liable to be expelled.
"Jaswant Singh has exhausted all constitutional options available to the party by deciding not to withdraw from the contest," a senior leader said here.
Meanwhile, BJP's Rajasthan state unit also said it is mulling disciplinary action against its rebel leaders, including Singh and Subhas Maharia.
"We have sought details about all such rebel candidates which will be referred to our disciplinary committee, which will take action against them as per the party rules. Rebels are expelled from the party for six years," Parnami told reporters.
Former Union ministers Singh and Maharia filed their nominations as Independent from Barmer and Sikar parliamentary constituencies, respectively, after BJP denied them ticket.