Chandra defeated INLD and Congress backed-Independent candidate R K Anand after 14 votes of the Congress were rejected, state Education Minister Ram Bilas Sharma told media here.
Singh was assured of a comfortable win while the main fight was between Chandra and Anand for the second seat.
Notably Congress had yesterday announced support for the INLD-backed Anand, a lawyer by profession, for one of the seats in the biennial elections.
Therefore, in case of rejection of 14 votes, Singh needed 26 votes for his win and his 14 votes as second preference were transferred to Chandra, taking his total number of votes to 29, Sharma said.
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At present, BJP has 47 MLAs in the Assembly, INLD 19, Congress 17 (with Kuldeep Bishnoi's two-member HJC merging with the party recently) and BSP and SAD 1 each while 5 are Independents.
After being re-elected, Singh thanked Prime Minister Narendra Modi and BJP President Amit Shah for re-nominating him.
He rejected allegations of any horse trading saying nothing of that sort happened.
"Congress votes were found to be invalid. After votes which were needed for my victory, the share of my votes got transferred to Chandra and this took the tally of his votes to 29," he said.
Singh claimed that former Chief Minister Bhupinder Singh Hooda did the same thing with Anand what he did to him while referring to rejection of 14 Congress votes.
After his candidate Anand faced defeat, leader of Opposition in Haryana Vidhan Sabha and INLD leader Abhay Singh Chautala blamed Congress and claimed, "Congress party's 14 votes were rejected because they registered their votes with another pen other than the one provided by the Returning Officer to record their votes in the voting compartment."
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The lone BSP member in Haryana Assembly had already announced his support to Chandra, who had also claimed the support of the Independent MLAs in Haryana, in his favour.
Earlier in the day, while reacting to reports that INLD MLA from Faridabad NIT Nagender Bhadana cast his vote in favour of Chandra, Chautala said Bhadana has accepted that he has returned a favour by supporting Chandra.
"What else can be bigger than this example of corruption? One member said he was allured and how he could now repay the favour. I think when CM held rally in his (Bhadana) constituency then he would have told him that he would announce development projects when he (Bhadana) supports the party as and when required. Today, he (Bhadana) has repaid the loan. Now we will tell him that you were elected on party ticket and you should not defy party's decision as it will affect your image," Chautala said.
"Our five MLAs were allured. The efforts to break the party have been happening for the past six months. Our five members were asked from CM (Khattar) side that if they want development projects in their respective constituencies then they should hold rally in his favour and should support him whenever there is a need. However, our five MLAs, who are loyal to the party informed me about the incident immediately.
"It is the CM's responsibility to carry out state's holistic development instead of alluring anybody. Such incidents hurt the image of the CM. I never expected that the CM will play such a game which is very sad... I will ask him during next assembly session about this," Chautala said.