Constitutional expert Abdul Aziz Bari said those suggesting for Johor to secede from Malaysia are not exempted from the Sedition Act 1948.

This, Aziz said, is in light of police's swift action against those who called for secession by Sabah and Sarawak.

"The attorney-general and police need to make a stand as to whether the prince has broken the law; namely the Sedition Act 1948 and the likes.

"These departments are under a duty to enforce the law equally on all citizens; the Johor prince is not immune under the law.

"Only the nine rulers enjoy that privilege, subject to the provision of the special court for the rulers," he told Malaysiakini .

Instagram posting

Aziz was responding to Johor prince Tunku Idris Sultan Ibrahim's Instagram posting of an agreement that suggested Johor could secede from Malaysia if its conditions for joining the federation were violated.

He pointed out that police had acted against several Sabahans and Sarawakians for merely voicing out "legitimate points of views" and did not propagate secession from the federation.

Elaborating on Tunku Idris' posting, Abdul Aziz who is attached with Universiti Selangor, said the Federal Constitution supersedes all previous agreements.

"An agreement of the past ceased to have its validity and force in the light of the existing Federal Constitution, the highest law of the land," he said.

Aziz argued that the prince may have legitimate views to air but it must be done within the confines of the highest law of the land.

"This (Federal Constitution) is the law that governs the relationship and rights between states and the central government.

"The Johor prince might have a point but he needs to square his arguments within the context and scheme of the Federal Constitution," he said.