The two regional parties, which had formed an alliance and contested the March-April Assembly election separately from the Congress-led grouping, have not finalised their decision.
The party's decision to approach the Opposition parties for a consensus candidate in the by-election was affirmed in its political affairs committee meeting on Thursday.
The party alleged that the BJP party-led government was working to reduce the Assamese people to a minority status in their own state in order to appease 'foreigners' who will be turned into voters.
Assam Jatiya Parishad (AJP) vice presidents Shamsher Singh and Kamal Nayan Choudhury visited state Congress chief Bhupen Bora at his residence and discussed the proposal.
The party alleged that the chief minister's sanction to make encounters the 'pattern in handling fleeing criminals' has led to doubts on the actual motives of these incidents.
"We were not in alliance during the polls. We broke the tie-up in the middle of the election. There was no united opposition platform, and so we parted ways," Gogoi said in an interview.
Assam Jatiya Parishad enclosed a video, which has gone viral showing Rama Kanta Dewri of handing over money to some women.
The AJP and jailed activist Akhil Gogoi's Raijor Dal are contesting the polls in an alliance.