Bhushan, who is AAP's founding member and father of the expelled rebel leader Prashant Bhushan, alleged that more than 40 National Council members have been served show-cause notices and some 90 people have not been informed about the meeting.
The NC meet will also elect the new National Executive members tomorrow as its three-year term expires this month.
"The meeting being held tomorrow is patently illegal and full of mala fide intentions. We are members of National Council of AAP and also the founding members of the party. We have been observing the fall in morals and values of the party for a long time and have proofs of wrong-doing and illegal activities being executed by the party," Bhushan said.
He said that the members of the Maharashtra unit have not been invited for the meeting.
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Bhushan has also accused the party leadership of bringing bouncers in the last meeting.
"Some of the National Council members have been suspended right after last week, when they started to ask questions about the process being followed in the meeting.
"AAP's constitution does not allow suspension of membership without providing due process of hearing," Bhushan added.