Chowna Mein was sworn in as the Deputy Chief Minister.
Son of late Chief Minister Dorjee Khandu, 37-year-old Pema, who became the youngest chief minister in the country, and Mein were administered the oath by Governor Tathagata Roy at the Rajbhavan here.
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Pema then staked claim to power on the basis of the support of 45 party MLAs along with two independents.
In a volte-face, ousted chief minister Khaliko Pul, also returned to the party fold with 30 dissident MLAs.
In the 60-member House with an effective strength of 58, Congress now claims the support of 47 MLAs, including two independents.