Sarawak DAP said Sarawak Chief Minister Adenan Satem's move in sending a memorandum on state autonomy to Putrajaya is an act of "subordination".
Its chief Chong Chieng Jen said equal partners would sit at the negotiating table together, not submit a memorandum for consideration.
"It seems that after the Sarawak election, the relationship between the federal government and Sarawak has returned to the previous 'master and slave' relationship," Chong said in a statement.
In the run-up to the state election, he said, Prime Minister Najib Abdul Razak visited Sarawak more than 50 times to show his "love for Sarawak" but "stopped loving" Sarawak since the landslide victory.
This included revealing now that the Pan-Borneo Highway development project would be paid from the existing state allocation, he said.
"If Adenan is true to his words that he wants more power and autonomy for Sarawak, the only way is for Sarawak BN to quit the Umno-controlled BN and to form a third force capable of tilting the balance of power in Putrajaya.
"So long as Sarawak BN and Adenan remain loyal to Najib, Najib and Umno will continue to hold on to this power," the Bandar Kuching MP said.
Adenan yesterday met with Najib inPutrajaya to submit two memoranda on the state government's stand on devolution of powers, the Inter-Governmental Committee (IGC) Report and recommendations, the Malaysia Agreement 1963 and the Report of the Cobbold Commission.