tokens: On 12 June 2018 , all Sarawak-based BN parties including Parti Pesaka Bumiputera Bersatu ( PBB ) , Parti Rakyat Sarawak ( PRS ) , Progressive Democratic Party ( PDP ) and Sarawak United People 's Party ( SUPP ) officially left Barisan Nasional forming a new coalition Sarawak Parties Alliance due to Barisan Nasional 's defeat in general elections on 9 May 2018 .