Punjab Chief Minister Bhagwant Mann and some of his cabinet colleagues and party MLAs are expected to accompany AAP supremo Arvind Kejriwal to the CBI headquarters in Delhi on Sunday, party sources said. Kejriwal has been summoned by the CBI at its office in Delhi for questioning in connection with the alleged irregularities in the formulation and implementation of the now-scrapped excise policy. He has been summoned as a witness and is not an accused in the case. After the CBI summons on Friday, Mann had said that it was very difficult to suppress Kejriwal’s voice.