Upset over not being allowed to contest the upcoming Lok Sabha polls from his home constituency, senior BJP leader Jaswant Singh is likely to resign from the party tomorrow.br br Mr Singh, 76, wanted to contest what is likely to be his last election, from Barmer, the constituency in Rajasthan where he was born. But the BJP ignored his request and instead decided to field Colonel (Retd) Sona Ram Choudhary, a former Congressman who recently joined the party.