Passage: Mahathir left UMNO in 2016, forming the Parti Pribumi Bersatu Malaysia (PPBM). The new party was officially registered on 9 September 2016, and Mahathir became its chairman. By 2017, he had officially joined the opposition coalition Pakatan Harapan. He was proposed as a possible chairman and prime ministerial candidate of Pakatan Harapan. He assumed the position of chairman on 14 July 2017.

Question: Where was he proposed to become chairman and a candidate?
Pakatan Harapan