I wrote two posts on India and the Citizenship Amendment Act, from the perspective of international law. The first relates to lessons from Myanmar and other legal options such as the CERD Inter-state communications mechanism. The second relates to the intervention by the UN High Commissioner for Human Rights at the Indian Supreme Court.
“State Responsibility for Citizenship in India: Lessons from Myanmar, and the CERD Inter-State Communications Mechanism”, https://opiniojuris.org/2019/12/21/state-responsibility-for-citizenship-in-india-lessons-from-myanmar-and-the-cerd-inter-state-communications-mechanism/
“Intervention of the UN High Commissioner for Human Rights at the Indian Supreme Court: International Law and the Citizenship Amendment Act”, https://opiniojuris.org/2020/03/05/intervention-of-the-un-high-commissioner-for-human-rights-at-the-indian-supreme-court-international-law-and-the-citizenship-amendment-act/