Rao, who had kept away from Chennai for the last three days triggering speculation whether he had reservations on swearing-in Sasikala, will reach here tomorrow afternoon but there was no word on what he plans to do.
Jurists were divided on whether Sasikala, against whose acquittal in a disproportionate assets case the Supreme Court is likely to deliver its verdict next week, can be sworn-in.
There were unconfirmed reports that AIADMK would even parade the MLAs before the President if the Governor delays the swearing-in of Sasikala.
In an act of defiance, Panneerselvam said an inquiry commission under a sitting Supreme Court judge will be set up to probe the "doubts" surrounding the health condition and demise of Jayalalithaa.
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Addressing the legislators, Sasikala, who had sacked Panneerselvam from the post of treasurer last night, launched a no-holds-barred attack on him, saying he had betrayed the party and "fully merged" with DMK which Jayalalithaa had fought all her life.
Accusing arch rival DMK of trying to destabilise the party, Sasikala said "betrayal" will never win in the AIADMK and that no one will be able to divide the party.
Panneerselvam, who was chosen by Jayalalithaa as stop-gap chief minister when she had to quit twice due to adverse court verdicts, today maintained that he enjoyed support of majority of MLAs and would prove it on the floor of the house at an appropriate time.
Former Speaker P H Pandian, who attacked Sasikala yesterday, and senior Rajya Sabha member Dr V Maitreyan today showed up at the Chief Minister's residence in a show of solidarity.
Panneerselvam also dismissed accusation by Sasikala that he was colluding with DMK and by others that Prime Minister Narendra Modi and BJP were backing him.
He said he was in touch with no one and that he did not need support of either DMK or BJP.
Lok Sabha Deputy Speaker M Thambidurai rejected Panneerselvam's claims and said that the party had all the 134 MLAs with it
"We are united. There is no dispute or difference," he said.
On his part, DMK Working President MK Stalin said his party had nothing to with "internal squabbles" in AIADMK and accused Sasikala of making false allegations after failing to become chief minister through a "short cut".