Mr Lyngdoh is a minister in chief minister Mukul Sangma's Cabinet.
Eight Meghalaya legislators including five Congress legislators on Friday resigned as members of the Meghalaya Assembly to contest the upcoming assembly elections on National People's Party (NPP) tickets.
Apart from Lyngdoh and Tynsong those who resigned today were, Sniawbhalang Dhar (Nartiang), Ngaitlang Dhar (Umroi), Comingone Ymbon (Raliang) all of the Congress, Remington Pyngrope (Mawkynrew) of the UDP, two independents, Stephanson Mukhim (Amlarem) and Hopeful Bamon (Sutnga-Saipung). "If the party did not change the leadership, the Congress may go down", Lyngdoh said.
The resignation of the five Congress MLAs has reduced the strength of the ruling party in the 60-member Meghalaya assembly to 24 as they come days after another party legislator PN Syiem also quit from his seat in the house.
All the eight sitting MLAs will be submitting their resignation to Assembly Speaker, Abu Taher Mondal on Friday at 11 am.
Stating his heart still beats for Congress, he said, he made a decision to move on and would formally join National Peoples Party (NPP) as he was ill-treated and humiliated for being an old man..
Hitting out at chief minister Mukul Sangma, the former deputy chief minister said, "The autocratic style of functioning of the chief minister had made it hard for me and others to function in the government".
It may be mentioned that till 2016, Lyngdoh was the Deputy Chief Minister of the State before he was dropped by the Chief Minister from the Cabinet.
Accusing chief minister Sangma of practicing "one-upmanship", Tynsong, however, said, "Despite his negativity, there is also a positive side too".
A day after five Congress MLAs resigned from the Meghalaya Assembly to contest upcoming polls on the ticket of NDA-affiliated National People's Party (NPP), Congress President Rahul Gandhi on Saturday removed former Chief Minister D.D. Lapang as state unit president and replaced him with Celestine Lyngdoh.
He said that he had advised the Chief Minister to get the expert opinion of the Election Commission of India and other legal experts before passing of the Bill. "We saw where we have landed ourselves laughing stock", Mr Tynsong said. Mr. Mukul Sangma is from the Garo tribe and that may not to the liking of some Khasi leaders. "He is courageous; whatever he says we had to do it".
"His style of functioning has forced him to abandon party founders and induct a new NPP (Non Permanent Party) (with members) like HS Shylla, Brening Sangma and Augustine Marak who are rolling ex-MLAs", Omillo stated in his resignation letter.