[6] UPP's ability to raise significant funds is widely attributed to the support they enjoy from Sarawak's powerful timber tycoons.

[13] Despite being arranged to be seated alongside the new governing Perikatan Nasional (PN) backbencher MPs in the Dewan Rakyat during the historic the one-day Parliament sitting on 17 May, Masir has clarified that he and the PSB party is still in the opposition bloc in the federal and state levels.

[14] Impact of the prolonged political crisis had also witnessed two former Sarawak People's Justice Party (PKR) legislature representatives; Selangau MP incumbent Ba Kelalan assemblyman Baru Bian and Batu Lintang assemblyman See Chee How, together with their supporters have joined PSB on 30 May 2020.

[16] PSB though stated it wish to remain an independent party without affiliation to any political alliance including PH.

[17] In the 2021 Sarawak state election, PSB managed to retain the four seats of Batu Lintang, Engkilili, Ba'kelalan and Bawang Assan, making it the largest opposition party in Sarawak, replacing Pakatan Harapan (PH) which only retained two seats of Pending and Padungan through the Democratic Action Party (DAP).

Upon the dissolution of PSB and the joining of its members in GPS, which was the state ruling coalition, Chong Chieng Jen took office as the Sarawak State Opposition Leader for the second term after the Sarawak opposition was left with only PH and DAP who were represented by only two MLAs Chong himself who was the Padungan MLA and Pending MLA Violet Yong Wui Wui.