Targeting rival politicians, Congress leaders included, Kejriwal today charged that they were "corrupt" and said that AAP would field candidates against all of them.
"BJP condemns the statement and expects that he will either present proof (backing)... The wild allegations or seek an apology... Otherwise, all options are open, including that of taking legal action," said party spokesperson Sudhanshu Trivedi.
Kejriwal had no authority to term his political opponents corrupt and engage in character assassination by making baseless allegations, he added.
"Kejriwal should graduate from getting childish enjoyment and pleasure from media attention (and become) a mature person who holds a constitutional post at the highest level in the state," he said.
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The BJP leader said Kejriwal had in the past made some allegations against former party chief Nitin Gadkari although he could not substantiate the same.
Kejriwal said he has drawn up a list of "corrupt" politicians against whom AAP has decided to field candidates.
The list included Rahul Gandhi, several UPA ministers, SP supremo Mulayam Singh Yadav, BSP chief Mayawati, Union Ministers P Chidambaram and Sushilkumar Shinde and former BJP president Nitin Gadkari, among others.
Congress, too, has hit out at the AAP chief over his claims.