Bersatu secretary-general Hamzah Zainudin has mooted a "political understanding charter" to form a grand coalition between Perikatan Nasional (PN), BN, and Sarawak's Gabungan Parti Sarawak (GPS) in the 15th general election.

Hamzah said PN-BN-GPS signing a pact would ensure continued cooperation between the three, as well as shore up public confidence.