As PKR and certain Umno factions continue to toy with a possible collaboration ahead of the 15th general election (GE15), a Pakatan Harapan leader has warned that this could chip away at the coalition's support base.

Newly-minted Harapan Youth chief Shazni Munir Mohd Ithnin said any cooperation with Umno, before or after GE15, must not involve the "court cluster" of leaders facing graft charges.

"You should not (work with the court cluster). If we head in that direction, the biggest concern is how do we explain this to the people?...