Assam Governor Prof Jagdish Mukhi and Chief Minister Sarbananda Sonowal saw him off at the Lokpriya Gopinath Bordoloi International airport.
Conrad Sangma, 40, son of former Lok Sabha Speaker P A Sangma, took charge of the National People's Party after his father's death in March 2016 and projected it as the main contender against the Congress, which had ruled the state for 10 years.
Union Home Minister Rajnath Singh, BJP president Amit Shah, Manipur Chief Minister N Biren Singh and BJP national spokesperson Nalin Kohli were present at the swearing-in ceremony.
A party meeting also decided that the two MLAs it has will not take part in the swearing-in ceremony of Conrad K Sangma as chief minister tomorrow, HSPDP president Ardent Basaiawmoit told reporters here.
"The Congress party respects the mandate of the people of Tripura, Nagaland and Meghalaya," Gandhi said on Twitter two days after results of assembly elections were declared. The Congress lost Meghalaya, though it emerged as the single largest party, and failed to open its account in Tripura and Nagaland.
Rahul Gandhi alleged that the BJP is "obsessed" with "grabbing" power and has shown "utter disregard" to the mandate of people in the state.
The Bhartiya Janata Party pulled the carpet from under the Congress' feet by formulating an alliance with the National People’s Party and three other regional parties.
"The governor has invited me to form the government since I have the numbers", Sangma said.
The 48-year-old managed to break the entire top leadership of the Trinamool Congress and the Congress to bring them into the BJP fold as well as build an Assam-style alliance with IPFT
Sangma has keen interest in music and has also organised number of musical events in the north-eastern Region.
The governor accepted the resignation and asked Sangma to be in charge till a new government is formed, a Raj Bhavan official said.
NPP president Conrad Sangma met Meghalaya Governor Ganga Prasad this evening and staked claim to form the government in the state with the support of 34 MLAs in the 60-member Assembly.
Assam minister and BJP leader Himanta Biswa Sarma said the verdict of the assembly elections in Meghalaya was against the Congress, which ruled the state for a decade, and against incumbent Chief Minister Mukul Sangma.
A delegation of three Congress leaders -- Kamal Nath, Ahmed Patel and CP Joshi -- met the governor at 7 pm last night, they said.
The BJP has emerged as a strong party in the North-East region by putting up a spectacular show in the Assembly Elections
Acche Din for North-East? The BJP has emerged as a strong party in the North-East region by putting up a spectacular show in the Assembly Elections
Elections were held in 59 seats in all three states due to different reasons despite them having 60-member assemblies.
Here is a quick look at the journey of Congress' Mukul Sangma.
The Congress could not establish a lead in any of the constituencies.
Outgoing Tripura Chief Minister Manik Sarkar can take shelter in West Bengal, Kerala, or Bangaladesh, says Assam minister Himanta Biswa Sarma
Meghalaya Chief Minister and Congress candidate Mukul Sangma wins from both Ampati and Songsak constituencies, EC sources said.
With election trends projecting that the Congress could emerge as the single-largest party in Meghalaya, the party today rushed two senior leaders to the northeastern state to explore possibilities of forming a government.
The ruling Congress is leading in 21 seats followed by the National People's Party (NPP) in 14 as trends are available for 53 seats in the Meghlaya Assembly elections.
The CPI(M)-led Left Front was trailing the BJP and its ally in Tripura with early trends from 40 seats indicating that the Left was ahead in 17 seats while the saffron party was leading in 23 constituencies, according to Election Commission sources.