"I oppose the Citizenship Amendment Bill. I truly feel that it will harm the Assamese society," Bora said in his resignation letter.
The Bill will bring a crisis on Assamese language-culture and completely nullify the Assam Accord, he added.
"This will also hurt the secular fabric of the Assamese society. I have always been opposing this Bill.
"On account of the Bill being passed in Lok Sabha, I could not agree with BJP party and so resigning from all posts, including primary membership," Bora said.
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