Lalduhoma was elected on 31 May 1984 as President of Mizoram INC. His political goal focussed on peace talk and then arranged for Ladenga to return to India. Laldenga and Indira Gandhi were scheduled to meet in the afternoon of 31 October, but Gandhi was assassinated in that morning. In the 1984 Lok Sabha election in December, Laduhoma was elected as an INC candidate from Mizoram constituency. He was compelled to abdicate as President of INC the same year. As his party lacked actions for peace to his expectations, he withdrew membership from INC in 1986, which became a violation of the provision under the Anti-Defection Law of 1985 to remain in legislatures. According to the Constitution of India (Fifty-Second Amendment of 1985) Tenth Schedule (paragraph 2 clause 1a), members of the parliament and state legislature can be disqualified if they leave the party for which they were elected. The Lok Sabha Speaker disqualified him on 24 November 1988, and became the first MP to be disqualified under the anti-defection law in India for giving up membership of the party which he represented. He later commented, saying, "I am proud of my first defection, of that decision... [because it was] for the cause of peace in my state, because the peace process was getting delayed." He formed Mizo National Union (MNU) in 1986 that later merged with Mizoram People's Conference and was made working President.