The BJP-IPFT government referred journalists Shantanu Bhowmik and Sudip Datta Bhowmik's murder cases to CBI for investigation.
IPFT president N C Debbarma also asked the BJP to select the chief minister from among the tribal MLAs.
He said Prime Minister Narendra Modi and many other Union ministers are likely to attend the oath-taking ceremony.
The BJP swept the polls in Tripura, bettered its performance in Nagaland and still hold the upper hand to form the next government in Meghalaya.
In a scintillating performance, the BJP seemed all set on Saturday to storm to power in Tripura in alliance with the tribal-based IPFT outfit, crushing the CPI-M led Left Front.
North-East Elections 2018 | As it happened: Left Front accepts defeat to BJP in Tripura; hung verdict in Meghalaya, Nagaland
The CPM conceded defeat in Tripura after its 25-year rule, saying "BJP has, apart from other factors, utilized massive deployment of money and other resources to influence the elections."
The Tripura police said they have arrested two men in connection with the killing of TV journalist Shantanu Bhowmik.