A day after creating history in Delhi's election, Aam Aadmi Party today maintained that it will not stake claim to form government and will play the role of a constructive opposition.

The party also said that it was the responsibility of the BJP, which is the single largest party, to form the government.

After a meeting of top party leaders at party chief Arvind Kejriwal's residence here, AAP leader Yogendra Yadav said, even if Lt Governor Najeeb Jung invites the party to form the government it will decline such an offer citing lack of majority.

"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 telling us to do so," he said.

Yadav also strongly ruled out taking support of Congress to form 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 last night that he will not stake claim to form a 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 number 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.

BJP with 31 seats has emerged as the single largest party in a House of 70, needing six more for the magic number of 36. AAP bagged 28 seats followed by Congress(8). BJP ally Akali Dal got one seat.

Kejriwal emerged the giant killer defeating three-time Chief Minister Sheila Dikshit by a huge margin.