The Brunei revolt on 8 December led by A. M. Azahari provided a "heaven-sent opportunity" to take action, as Lim had met Azahari on 3 December. The Malayan government convened the ISC to discuss the operation, while Singapore's Special Branch produced alleged evidence of the communist control of Barisan. On 13 December, Lord Selkirk gave his authorisation for the arrests to proceed on 16 December. However, Lee's attempt to add two Malayan parliamentarians opposed to the formation of Malaysia into the arrest list caused the Malayan representative to rescind his consent, stopping the operation. Tunku suspected that Lee was trying to eliminate his entire opposition, while Lee felt that Tunku was evading his shared responsibility for the arrests.