The party also said that it was the responsibility of the Bharatiya Janata Party, which is the single largest party, to form the government.
After a meeting of top party leaders at party chief Arvind Kejriwal's residence in Delhi, AAP leader Yogendra Yadav said that even if Lieutenant Governor Najeeb Jung invites the party to form the government, it will decline such an offer, citing lack of numbers.
"We are not going to form the government. We will sit in the opposition and play the role of a constructive opposition. As per the Constitution, the largest party has to take the responsibility of forming government," Yadav said.
"We have not got majority so it is very surprising that the number one party, (BJP), is not ready to form the government and it is telling us to do so," he said.
Yadav also strongly ruled out taking support from the Congress to form the government.
The BJP has also expressed its reluctance to stake claim, saying it did not have the numbers to provide a stable government.
BJP's chief ministerial candidate Harsh Vardhan had said on Sunday night that he will not stake claim to form the government as his party is short of a clear majority and would prefer to sit in the Opposition than indulge in any "horse trading".
"Since I don't have the numbers, I cannot stake my claim in forming my government in Delhi. Since I don't have the magic number of 36, I really cannot be a part of the government formation in Delhi," he had said.
The BJP, with 31 seats, has emerged as the single largest party in a House of 70. It needs six more seats to reach the magic number of 36. The AAP bagged 28 seats, followed by Congress,, which won 8 seats. BJP’s ally Akali Dal has got one seat.
Kejriwal emerged the giant killer in Delhi polls, defeating three-time chief minister Sheila Dikshit by a huge margin.
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