The All Assam Students' Union (AASU) had first announced a 11-hour shutdown against the Bill, its first such call in more than a decade.
The proposal has been hotly contested in Assam, a hilly state that has witnessed violence between settlers and indigenous groups, who say they have lost land and jobs to the newer entrants.
"This is going to backfire on the BJP", he said, pointing to the anger in Assam.
India's lower house of parliament has approved a bill that would grant residency and citizenship rights to non-Muslim immigrants, sparking protests that brought the country's populous northeast to a near standstill.
"If the bill is passed, Assam will burn".
AGP chose to snap ties with the BJP over the Citizenship Bill, which they say will make the Assam Accord "meaningless".
The Congress and the AIUDF also lashed out at senior minister Himanta Biswa Sarma for claiming that the state will "go Jinnah's way if the Citizenship Bill is not passed".
"We will oppose the Bill in a bigger way now".
While speaking in Silchar, Assam on Friday, Prime Minister Narendra Modi reiterated the Centre's commitment to pass the Citizenship Amendment Bill.
In Nagaland, the cabinet of the NDPP-BJP alliance government has made a decision to ask the Centre to reconsider the bill.
"It is pertinent to mention herein that the Asom Gana Parishad is fully committed to the implementation of the provisions of the Assam Accord and hence we can never support the obnoxious Citizenship (Amendment) Bill, 2016", the AGP said in the letter.
"They have no place to go except India", Home Minister Rajnath Singh told parliament on Tuesday.
The AGP had placed its reservations on the bill before the Joint Parliamentary Committee when the panel had visited the state and also tried to mobilise opinion against the bill among NDA constituents such as the JD (U) and the Shiv Sena, and opposition parties.
The bill - aggressively pushed by the BJP-led government - has become a political and social flashpoint, particularly in the backdrop of the National Register of Citizens (NRC) being updated in Assam.
"Further, the Assam Accord is also meant to be made meaningless", the letter alleged. "The AGP protested against the bill ever since it was proposed", the AGP founder said.
The announcement followed AGP leader and former chief minister Prafulla Kumar Mahanta's statement that the party would withdraw support to the government in the state if the Citizenship (Amendment) Bill, 2016 in passed by Lok Sabha.
The AGP had three ministers, including Bora, in the state. Many activists believe that the very idea of granting citizenship in this manner amounts to dilution of the Assam Accord-1985, which clearly states that any immigrant who entered Assam illegally after 1971 should be deported irrespective of his/her religion.
Earlier on January 7, a section of protestors belonging to the Krishak Mukti Sangram Samiti, an influential peasants' body, and other organisations staged a nude demonstration in New Delhi as the Bill was being tabled in Parliament.
The Bill aims to amend the Citizenship Act, 1955, to make illegal migrants who are Hindus, Sikhs, Buddhists, Jains, Parsis and Christians from Afghanistan, Bangladesh and Pakistan eligible for citizenship of India.
The BJP has already declared its Mission 21 - party chief Amit Shah's target of winning 21 of 25 Lok Sabha seats - in the region in 2019.