A party meeting also decided that the two MLAs it has will not take part in the swearing-in ceremony of Conrad K Sangma as chief minister tomorrow, HSPDP president Ardent Basaiawmoit told reporters here.
The Hills State Peoples Democratic Party (HSPDP) has won two seats in the election, but its president has lost to an independent candidate by only 76 votes.
In the 60-member Assembly with an effective strength of 59, at least 30 seats is required to form majority.
Conrad K Sangma has the support of 34 MLAs - his own party the NPP (19 seats), the BJP (2), the UDP (6), the PDF (4), the HSPDP (2) and an Independent.
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The Congress was the single largest party bagging 21 seats.
The party's two MLAs are signatories to the letter of support to the NPP-led coalition government.
Basaiawmoit led central executive leaders of the party to the residence of United Democratic Party president Donkupar Roy expressing "disappointment and disagreement" to the proposal made by the UDP that Conrad should be the CM.
The HSPDP had a pre-poll alliance with the UDP.
"This decision was taken unilaterally by the UDP and without consulting us. It is the job of the alliance to decide who should lead the government," he said.
The party also prefers an elected MLA of the NPP to take the post of the chief minister and Conrad K Sangma who is an MP, he said.
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