"Zoramthanga in consultation with Vanlalzawma will make a final decision by Monday," state assembly speaker and member of Political Affairs Committee (PAC) Lalchamliana said after a meeting in the chief minister's residence here.
The MNF supported the Indo-US nuclear deal, but the PAC did not take any decision on supporting the Congress-led UPA government or voting against it along with erstwhile ally, the NDA, he said.
"Vanlalzawma, now in New Delhi, is closely watching the political developments at the Centre and the PAC authorised Zoramthanga to make the final decision after consulting with the MP," he said.
He added that the option of abstention from the trial of strength next Tuesday was also raised during the meeting.
The four-hour MNF's PAC meeting, chaired by Zoramthanga was attended by Home minister Tawnluia, Health minister Tlanghmingthanga, Rural Development minister H Vanlalauva and the PAC secretary R Vanlalruata.