PKR secretary-general Rafizi Ramli, in an appeal to be allowed entry into Sarawak, has promised that he will not criticise Chief Minister Adenan Satem in any way.

Instead, Rafizi said he will only focus his criticisms on Prime Minister Najib Abdul Razak and the federal government.

This is contained in a letter addressed to Adenan after the chief minister said he may consider allowing opposition leaders into the state if they asked “politely”.

“I request your good will to allow me to enter Sarawak at least for the purpose of campaigning in this state election even if you are not prepared to cancel the order barring me from Sarawak since April 2014.

"I assure you that I will not criticise you, your family, or administration led by you.

"My campaign will focus on the weaknesses of Prime Minister Najib Abdul Razak at the federal level," he said in the letter.

Rafizi said the letter was his undertaking to "behave", as requested by Adenan.

The Pandan MP is among more than 20 opposition politicians barred from Sarawak ahead of the May 7 state election.

The most senior leaders in the federal opposition, including Penang Chief Minister Lim Guan Eng and Selangor Menteri Besar Azmin Ali, were allowed in but were ordered to leave the state before polling day.